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Orthodox calendar used c. 691–1728 From Wikipedia, the free encyclopedia
The Byzantine calendar, also called the Roman calendar,[note 1] the Creation Era of Constantinople or the Era of the World (Ancient Greek: Ἔτη Γενέσεως Κόσμου κατὰ Ῥωμαίους,[1] also Ἔτος Κτίσεως Κόσμου or Ἔτος Κόσμου; lit. 'Roman year since the creation of the universe', abbreviated as ε.Κ.), was the calendar used by the Eastern Orthodox Church from c. 691 to 1728 in the Ecumenical Patriarchate.[2][note 2] It was also the official calendar of the Byzantine Empire from 988 to 1453 and it was used in Russia until 1700.[note 3] This calendar was used also in other areas of the Byzantine commonwealth such as in Serbia, where it is found in old Serbian legal documents such as Dušan's Code, thus being referred to as the Serbian Calendar as well.
The calendar was based on the Julian calendar, except that the year started on 1 September and the year number used an Anno Mundi epoch derived from the Septuagint version of the Bible. It placed the date of creation at 5509 years before the incarnation of Jesus, and was characterized by a certain tendency that had already been a tradition among Jews and early Christians to number the years from the calculated foundation of the world (Latin: Annus Mundi or Ab Origine Mundi— "AM").[note 4] Its Year One, marking the assumed date of creation, was September 1, 5509 BC, to August 31, 5508 BC. This would make the current year (AD 2024) 7533 (7532 before September 1; and 7533 after September 1).
The first appearance of the term is in the treatise of a monk and priest, Georgios (AD 638–639), who mentions all the main variants of the "World Era" in his work.[4][5] Georgios argues that the main advantage of the World era is the common starting point of the astronomical lunar and solar cycles, and of the cycle of indictions, the usual dating system in Byzantium since the 6th century. He also regarded it as the most convenient for the Easter computus. For the details see the section "Tabular Byzantine calendar" below. Complex calculations of the 19-year lunar and 28-year solar cycles within this world era allowed scholars to attribute cosmic significance to certain historical dates, such as the birth or the crucifixion of Jesus.[6]
This date underwent minor revisions before being finalized in the mid-7th century, although its precursors were developed c. AD 412. By the second half of the 7th century, the Creation Era was known in Western Europe, at least in Great Britain.[5][note 5] By the late 10th century (around AD 988), when the era appears in use on official government records, a unified system was widely recognized across the Eastern Roman world.
The era was ultimately calculated as starting on September 1, and Jesus was thought to have been born in the year 5509 since the creation of the world.[7][note 6] Historical time was thus calculated from the creation, and not from Christ's birth as it was in the west after the Anno Domini system adopted between the 6th and 9th centuries. The eastern Church avoided the use of the Anno Domini system of Dionysius Exiguus, since the date of Christ's birth was debated in Constantinople as late as the 14th century.
The Byzantine calendar was identical to the Julian calendar except that:
The leap day of the Byzantine calendar was obtained in an identical manner to the bissextile day of the original Roman version of the Julian calendar, by doubling the sixth day before the calends of March, i.e., by doubling 24 February.
The Byzantine World Era was gradually replaced in the Eastern Orthodox Church by the Christian Era (Anno Domini), which was utilized initially by Patriarch Theophanes I Karykes in 1597, afterwards by Patriarch Cyril Lucaris in 1626, and then formally established by the Church in 1728.[2][note 2] Meanwhile, as Russia received Orthodox Christianity from Byzantium, it inherited the Orthodox calendar based on the Byzantine Era (translated into Slavonic). After the collapse of the Byzantine Empire in 1453, the era continued to be used by Russia, which witnessed millennialist movements in Moscow in AD 1492 (7000 AM).[note 10] It was only in AD 1700 that the Byzantine calendar in Russia was changed to the Julian calendar by Peter the Great.[14] It still forms the basis of traditional Orthodox calendars up to today. September AD 2000 began the year 7509 AM.[note 11]
The earliest extant Christian writings on the age of the world according to the biblical chronology are by Theophilus (AD 115–181) in his apologetic work To Autolycus,[15] and by Julius Africanus (AD 200–245) in his Five Books of Chronology.[16] Both of these early Christian writers, following the Septuagint version of the Old Testament, determined the age of the world to have been about 5,530 years at the birth of Christ.[17]
Ben Zion Wacholder points out that the writings of the Church Fathers on this subject are of vital significance (even though he disagrees with their chronological system based on the authenticity of the Septuagint, as compared to that of the Masoretic Text), in that through the Christian chronographers a window to the earlier Hellenistic biblical chronographers[note 12] is preserved:
An immense intellectual effort was expended during the Hellenistic period by both Jews and pagans to date creation, the flood, exodus, building of the Temple... In the course of their studies, men such as Tatian of Antioch (flourished in 180), Clement of Alexandria (died before 215), Hippolytus of Rome (died in 235), Julius Africanus of Jerusalem (died after 240), Eusebius of Caesarea in Palestine (260–340), and Pseudo-Justin frequently quoted their predecessors, the Graeco-Jewish biblical chronographers of the Hellenistic period, thereby allowing discernment of more distant scholarship.[18]
The Hellenistic Jewish writer Demetrius the Chronographer (flourishing 221–204 BC) wrote On the Kings of Judea which dealt with biblical exegesis, mainly chronology; he computed the date of the flood and the birth of Abraham exactly as in the Septuagint,[note 13] and first established the Annus Adami (Era of Adam), the antecedent of the Hebrew World Era, and of the Alexandrian and Byzantine Creation Eras.
The Alexandrian Era (Ancient Greek: Κόσμου ἔτη κατ’ Ἀλεξανδρεῖς, Kósmou étē kat'Alexandreîs) developed in AD 412, was the precursor to the Byzantine Era. After the initial attempts by Hippolytus, Clement of Alexandria and others,[note 14] the Alexandrian computation of the date of creation was worked out to be 25 March 5493 BC.[20]
The Alexandrine monk Panodorus reckoned 5904 years from Adam to the year AD 412. His years began with August 29 (August 30 in the year preceding a leap year), corresponding to the First of Thoth, the Egyptian new year.[21] Annianos of Alexandria however, preferred the Annunciation style[clarification needed] as New Year's Day, 25 March, and shifted the Panodorus era by about six months, to begin on 25 March. This created the Alexandrian Era, whose first day was the first day of the proleptic[note 15] Alexandrian civil year in progress, 29 August 5493 BC, with the ecclesiastical year beginning on 25 March 5493 BC.
This system presents in a masterly sort of way the mystical coincidence of the three main dates of the world's history: the beginning of Creation, the incarnation, and the Resurrection of Jesus Christ. All these events happened, according to the Alexandrian chronology, on 25 March; furthermore, the first two events were separated by the period of exactly 5500 years; the first and the third one occurred on Sunday — the sacred day of the beginning of the Creation and its renovation through Christ.[5]
Dionysius of Alexandria had earlier emphatically quoted mystical justifications for the choice of March 25 as the start of the year:
March 25 was considered to be the anniversary of Creation itself. It was the first day of the year in the medieval Julian calendar and the nominal vernal equinox (it had been the actual equinox at the time when the Julian calendar was originally designed). Considering that Christ was conceived at that date turned March 25 into the Feast of the Annunciation which had to be followed, nine months later, by the celebration of the birth of Christ, Christmas, on December 25.
The Alexandrian Era of March 25, 5493 BC was adopted by church fathers such as Maximus the Confessor and Theophanes the Confessor, as well as chroniclers such as George Syncellus. Its striking mysticism made it popular in Byzantium, especially in monastic circles. However this masterpiece of Christian symbolism had two serious weak points: historical inaccuracy surrounding the date of the resurrection of Jesus as determined by its Easter computus,[note 16] and its contradiction to the chronology of the Gospel of St John regarding the date of the crucifixion of Jesus on Friday after the Passover.[5]
A new variant of the World Era was suggested in the Chronicon Paschale, a valuable Byzantine universal chronicle of the world, composed about the year AD 630 by some representative of the Antiochian scholarly tradition.[5] It had for its basis a chronological list of events extending from the creation of Adam to the year AD 627. The chronology of the writer is based on the figures of the Bible and begins with 21 March, 5507.
For its influence on Greek Christian chronology, and also because of its wide scope, the Chronicon Paschale takes its place beside Eusebius, and the chronicle of the monk Georgius Syncellus[22] which was so important in the Middle Ages; but in respect of form it is inferior to these works.[23]
By the late 10th century, the Byzantine Era, which had become fixed at September 1 5509 BC since at least the mid-7th century (differing by 16 years from the Alexandrian date, and 2 years from the Chronicon Paschale), had become the widely accepted calendar of choice par excellence for Chalcedonian Orthodoxy.
John Chrysostom says in his Homily "On the Cross and the Thief", that Christ "opened for us today Paradise, which had remained closed for some 5000 years."[24]
Isaac the Syrian writes in a Homily that before Christ "for five thousand years five hundred and some years God left Adam (i.e. man) to labor on the earth."[25]
Augustine of Hippo writes in the City of God (written AD 413–426):
Augustine goes on to say that the ancient Greek chronology "does not exceed the true account of the duration of the world as it is given in our documents (i.e. the Scriptures), which are truly sacred."
Hippolytus of Rome (c. 170–235) maintained on Scriptural grounds that Jesus's birth took place in AM 5500, and held that the birth of Christ took place on a passover day, deducing that its month-date was 25 March[26] (see Alexandrian Era). He gave the following intervals:
In his Commentary on Daniel, one of his earlier writings, he proceeds to set out additional reasons for accepting the date of AM 5500:
Around AD 202 Hippolytus held that Jesus was born in the 42nd year of the reign of Augustus and that he was born in AM 5500.[note 17] In his Commentary on Daniel he did not need to establish the precise year of Jesus's birth; he is not concerned about the day of the week, the month-date, or even the year; it was sufficient for his purpose to show that Christ was born in the days of Augustus in AM 5500.
From Justinian's decree in AD 537 that all dates must include the Indiction, the unification of the theological date of creation (as yet unfinalized) with the administrative system of Indiction cycles became commonly referred to amongst Byzantine authors, to whom the indiction was the standard measurement of time.
In the year AD 691, we find the Creation Era in the Acts of the Quinisext Council:
... as of the fifteenth day of the month of January last past, in the last fourth Indiction, in the year six thousand one hundred and ninety"[28]
We find the era also in the dating of the so-called Letter of three Patriarchs to the emperor Theophilos (April, indiction 14, 6344 = AD 836).
By the 10th century the Byzantine Era is found in the Novellas of AD 947, 962, 964, and most surely of the year AD 988, all dated in this way, as well as the Act of Patriarch Nicholaos II Chrysobergos in AD 987.[5]
John Skylitzes' (c. 1081–1118) major work is the Synopsis of Histories, which covers the reigns of the Byzantine emperors from the death of Nicephorus I in 811 to the deposition of Michael IV in 1057; it continues the chronicle of Theophanes the Confessor. Quoting from him as an example of the common Byzantine dating method, he refers to emperor Basil, writing that:
In the year 6508 [1000], in the thirteenth indiction, the emperor sent a great force against the Bulgarian fortified positions (kastra) on the far side of the Balkan (Haimos) mountains,..."[7]
Niketas Choniates (c. 1155–1215), sometimes called Acominatus, was a Byzantine Greek historian. His chief work is his History, in twenty-one books, of the period from 1118 to 1207. Again, an example of the dating method can be seen as he refers to the fall of Constantinople to the fourth crusade as follows:
The queen of cities fell to the Latins on the twelfth day of the month of April of the seventh indiction in the year 6712 [1204]."[29]
The historian Doukas, writing c. AD 1460, makes a detailed account for the Creation Era. Although unrefined in style, the history of Doukas is both judicious and trustworthy, and it is the most valuable source for the closing years of the Byzantine empire.
From Adam, the first man created by God, to Noah, at whose time the flood took place, there were ten generations. The first, which was from God, was that of Adam. The second, after 230 years, was that of Seth begotten of Adam. The third, 205 years after Seth, was that of Enos begotten of Seth. The fourth, 190 years after Enos, was that of Kainan begotten of Enos. The fifth, 170 years after Kainan, was that of Mahaleel begotten of Kainan. The sixth, 165 years after Mahaleel, was that of Jared begotten of Mahaleel. The seventh, 162 years after Jared, was that of Enoch begotten of Jared. The eighth, 165 years after Enoch, was that of Methuselah begotten of Enoch. The ninth, 167 years after Methuselah, was that of Lamech begotten of Methuselah. The tenth, 188 years after Lamech, was that of Noah. Noah was 600 years old when the flood of water came upon the earth. Thus 2242 years may be counted from Adam to the flood.
There are also ten generations from the flood to Abraham numbering 1121 years. Abraham was seventy-five years old when he moved to the land of Canaan from Mesopotamia, and having resided there twenty-five years he begat Isaac. Isaac begat two sons, Esau and Jacob. When Jacob was 130 years old he went to Egypt with his twelve sons and grandchildren, seventy-five in number. And Abraham with his offspring dwelt in the land of Canaan 433 years, and having multiplied they numbered twelve tribes; a multitude of 600,000 were reckoned from the twelve sons of Jacob whose names are as follows: Ruben, Symeon, Levi, Judah, Issachar, Zebulun, Naphtali, Gad, Asher, Dan, Joseph, and Benjamin.
The descendants of Levi were Moses and Aaron; the latter was the first of the priesthood while Moses was appointed to govern. In the eightieth year of his life, he walked through the Red Sea and led his people out of Egypt. This Moses flourished in the time of Inachos [son of Oceanus and King of Argos] who was the first [Greek] king to reign. Thus the Jews are more ancient than the Greeks.
Remaining in the wilderness forty years they were governed for twenty-five years by Joshua, son of Nun, and by the Judges for 454 years to the reign of Saul, the first king installed by them. During the first year of his reign, the great David was born. Thus from Abraham to David fourteen generations are numbered for a total of 1024 years. From David to the deportation to Babylon [586 BC] there are fourteen generations totaling 609 years. From the Babylonian Captivity to Christ there are fourteen generations totaling 504 years.
By the sequence of Numbers we calculate the number of 5,500 years from the time of the first Adam to Christ.[30]
Even the most mystical Fathers such as St. Isaac the Syrian accepted without question the common understanding of the Church that the world was created "more or less" in 5,500 BC. As Fr. Seraphim Rose points out:
For early Christians, the creation of the world was neither a matter of dogma nor a cosmological problem. As part of a history centered on Man, it was a divine act whose reality was beyond any doubt.[32][note 6]
In the Byzantine period, the day was divided into two 12-hour cycles fixed by the rising and setting of the sun.
Marcus Rautman points out that the seven-day week was known throughout the ancient world. The Roman Calendar had assigned one of the planetary deities to each day of the week. The Byzantines naturally avoided using these Latin names with their pagan echoes. They began their week with the "Lord's Day" (Kyriake), followed by an orderly succession of numbered days: Deutera ("2nd"), Trite ("3rd"), Tetarte ("4th"), and Pempte ("5th"), a day of "preparation" (Paraskeve), and finally Sabatton.[34]
Each day was devoted to remembering one event of the life of Christ or the Theotokos or several martyrs or saints, whose observed feast days gradually eclipsed traditional festivals. Kyriake was seen as the day of resurrection of Christ and as both the first and eighth day of the week, in the same way that Christ was the alpha and omega of the cosmos, existing both before and after time. The second day of the week recognized angels, "the secondary luminaries as the first reflections of the primal outpouring of light", just as the sun and the moon had been observed during the Roman week. John the Baptist, the forerunner (Prodromos) of Christ, was honored on the third day. Both the second and third days were viewed as occasions for penitence. The fourth and sixth days were dedicated to the Cross. The fourth day to the Theotokos and her mourning of the loss of her son and the sixth day (the Paraskeue) as the day of the Crucifixion of the Lord, with holy songs sung and fasting in remembrance of these events. St. Nicholas was honored on the fifth day of the week, while the Sabatton day was set aside for the saints and all the deceased faithful. This order is still in use in the Orthodox Church and the Eastern Catholic Churches.[35]
A special arrangement of the way in which the hymns were sung was set for each day of the eight-week cycle, the "Octoechos (liturgy)". This cycle begins on the first Sunday after Easter ("Thomas-Sunday") and contains the texts whose content represents the meaning of the days of the week. The hymns sung on these eight weeks were performed with the use of eight different modes also called Octoechoi.[36]
As the Greek and Roman methods of computing time were connected with certain pagan rites and observances, Christians began at an early period to adopt the Hebrew practice of reckoning their years from the supposed period of the creation of the world.[45]
Currently the two dominant dates for creation that exist using the biblical model are about 5500 BC and about 4000 BC. These are calculated from the genealogies in two versions of the Bible, with most of the difference arising from two versions of Genesis. The older dates of the Church Fathers in the Byzantine Era and in its precursor, the Alexandrian Era, are based on the Greek Septuagint. The later dates of the Ussher chronology and the Hebrew calendar are based on the Hebrew Masoretic Text.
The Fathers were well aware of the discrepancy of some hundreds of years between the Greek and Hebrew Old Testament chronology,[note 18] and it did not bother them; they did not quibble over years or worry that the standard calendar was precise "to the very year"; it is sufficient that what is involved is beyond any doubt a matter of some few thousands of years, involving the lifetimes of specific men, and it can in no way be interpreted as millions of years or whole ages and races of men.[47]
To this day, traditional Orthodox Christians will use the Byzantine calculation of the World Era in conjunction with the Anno Domini (AD) year. Both dates appear on Orthodox cornerstones, ecclesiastical calendars and formal documents. The ecclesiastical new year is still observed on September 1 (or on the Gregorian calendar's September 14 for those churches which follow the Julian calendar). September 2024 marked the beginning of the year 7533 of this era.
The tabular Byzantine calendar is used to calculate the date of Easter. It dates back to AD 284, when the new moon fell on the fifth epagemonal day of the Alexandrian calendar (28 August). Eusebius (vii.32) recounts that Anatolius of Laodicea was the first to arrange the 19-years cycle (when the new moon returns to the same Julian date) for ecclesiastical purposes. Anatolius says that he places the new moon of the first year of his cycle on the Alexandrian equivalent of 22 March, the day of the vernal equinox. In the Julian calendar, the equinox recedes at the rate of 1 day in 128 years; by the time of the First Council of Nicaea in AD 325 it was falling on 21 March. 22 March is 26 Phamenoth in the Alexandrian calendar.
The lunar new year was not allowed to begin before 15 Thoth (12 September, or 13 September if the following February has 29 days), and the month in which Easter fell was not allowed to begin before 12 Phamenoth (8 March). As the paschal full moon (the full moon before Easter), like all full moons is assigned to the 14th day of the lunar month, its earliest date was thus 25 Phamenoth (21 March), and Easter fell at earliest on 26 Phamenoth (22 March) and at latest on 30 Pharmouthi (25 April). The month in which Easter fell could thus begin no later than 10 Pharmouthi (5 April) and the Easter full moon could fall no later than 18 April (23 Pharmouthi).
If, at the end of the twelfth lunar month, the next lunar month would begin before 15 Thoth, an additional 30-day month was inserted. This caused Easter to jump forward in years 3, 6, 9, 11, 14, 17 and 19 of the cycle. The lunar date of the sixth epagemonal day (considered the first day of a leap year) was the same as that of the previous day. The Alexandrian months, all of thirty days, are:
The first lunar month had 29 days, and following lunar months had 30 and 29 days alternately. Thus the sixth lunar month, preceding the one in which Easter fell, had 30 days, minimising the chance of Easter clashing with Passover. This calendar uses the Callippic cycle of 76 years, under which the lunar year averages 365.25 days. But with this arrangement the lunar year averages 366.25 days. Therefore, in cycle 19, when the eleventh lunar month began on 7 Mesore and had 29 days, the next month (beginning on 1 Thoth) also had 29 days (saltus lunae) and the first month of the new lunar year began on 30 Thoth. In the sixth century, after it accepted that it no longer mattered if the birthday of Rome (23 April) fell within Lent, the Roman church abandoned its own calculation (the Supputatio Romana) for the Alexandrian one. This involved recasting the lunar months so that their first days were given in terms of the Julian calendar. While Easter continued to jump forward in years 3, 6, 8, 11, 14, 17 and 19 of the cycle the extra months were more equitably spaced, generally being hidden within those Julian months which contained two new moons. Their starting dates were:
In addition to its error of 1 day in 128 years as regards the sun the Julian calendar had an error of 1 day in 308 years as regards the moon in the same direction - thus by 1582 the actual new moons were falling three days earlier than their tabulated dates. Pope Gregory XIII wanted to reform the calendar, which he did by decreeing that most centennial years would not be leap years. He also brought the tabular equinox back to 21 March by omitting the ten days 5 to 14 October 1582. He decided that Easter would continue to fall between 22 March and 25 April in his new calendar, which posed a problem - the First Council of Arles in AD 314 had decreed that Easter would be observed by all on the same day, so it was not open to him to change it unilaterally. Also the First Council of Nicaea in AD 325 had decreed that the Easter full moon must not fall before the equinox and the tables were constructed to agree as nearly as possible with the Jewish calendar - in fact after they were constructed in the third century they were declared to be a more accurate version of the Jewish calendar than the one the Jews themselves were using.[48] Gregory got round that by lying - claiming that the Council had decreed that Easter would be the Sunday after the first full moon after the equinox. The result was that instead of falling during the Passover Easter began to fall more and more frequently within the last Jewish month. This could not be more unfortunate, because the full moon of that month is marked by the rumbustious festival of Purim, which could not be less appropriate for the solemnities of Holy Week. Hence the surreal situation in Stamford Hill on Palm Sunday, 24 March 2024, when a small Muslim boy, watching the Purim festivities, asked his mother "Is it Easter?" to which she replied "No. Easter is Jesus Christ. It is completely different."
Gregory moved the new moons back three days, to make them agree with the real new moons. To keep them in agreement, he instituted the "lunar correction", whereby they are shifted back 1 day 8 times in 2500 years. The next 8 adjustments will occur on 1 March of the years 2100, 2400, 2700, 3000, 3300, 3600, 3900 and 4300. While Gregory decreed that the "solar correction" (the omission of a centennial leap day) occur 3 times in 400 years, this only reduces the backward movement of the equinox to 1 day in 3323 years. Orthodox churches instead apply the correction 7 times in 900 years, keeping the calendar correct to one day in 44,000 years. In the Exigian calendar the rule is that a centennial year is only a leap year if it gives remainder 200 or 700 when divided by 900. The first centennial leap year was 1600 and the second 2000. This arrangement means that when the calendar is projected beyond the Christian era the rule is the same - thus the first two centennial leap years were -200 (201 BC) and -700 (701 BC).[49] It also minimises the number of occasions on which the dates of the new moons are moved in a centennial year. As the solar correction moves them forward a day and the lunar correction moves them back a day, when these corrections coincide (e.g. in 2100, 2400 and 2700) they stay where they are.
The names of the lunar months are as follows:
Seven times in 19 years an additional 30 day month (Paul II) occurs between Paul and Harriet. To aid use (in religious houses the lunar date of the following day is announced daily at Lauds after the reading of the Martyrology) months commemorating female saints have 29 days and months commemorating male saints (apart from the saltus lunae) have 30 days. The repetition of the lunar date on the leap day is preserved - thus 28 February 2028 is 3 Ronan bis, 29 February is 3 Ronan and 1 March is 4 Ronan. In houses where the leap day continues to be placed between 23 and 24 February the sequence is modified accordingly. The derivation of the names is as follows:
Occidental Easter generally falls between 15 and 21 Miri, on whichever day is Sunday. There are three exceptions:
(1) If 14 Miri falls on 18 April and a golden number is marked against 6 April, Easter falls on 18 April (if Sunday) and otherwise on the Sunday following 18 April. The golden number marks the year's position in the 19-year cycle and is placed in the calendar against the first days of the lunar months.
(2) If 14 Miri falls on 19 April Easter falls on 19 April (if Sunday) and otherwise on the Sunday following 19 April.
(3) If 14 Miri falls on 20 April or later the date against which it stands is to be treated as a day of March and Easter falls on the day after the Saturday following that date.
Example calculation
On what date does occidental Easter fall in 2025?
2025 + 1 = 2026; 2026/19 = 106 remainder 12. The golden number is 12. In the calendar, 12 (marking 1 Miri) stands against 31 March. The dominical letter is E. This is placed against all the Sundays in the year. A leap year has two dominical letters, one for January and February and the other (one place back in the series) for March to December. Easter falls on 20 April because that is an E day and the date, 21 Miri, lies between 15 and 21 Miri (inclusive).
Orthodox Easter does not admit the lunar correction. Therefore, when Gregory moved the new moons back three days Orthodox Easter fell between 18 and 24 Miri. Another correction in 1800 means that until 2099 Orthodox Easter falls between 19 and 25 Miri, and so on. As 20 April is 21 Miri, Orthodox Easter falls on that day.
LUNAR CALENDAR 1 MARCH 1900 - 28 FEBRUARY 2200
JAN Paul 30 | FEB Harr 29 | MAR Ron 30 | APR Miri 29 | MAY Jame 30 | JUN Eloi 29 | JUL Thom 30 | AUG vii 29 | SEPT Nich 30 | OCT Cath 29 | NOV Rich 30[50] | DEC Emma 29 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | A 12 | d 1 | d 12 | g 1 | b | e 9 | g | c 17 | f | A | d 3 | f 3 |
2 | b 1 | e | e 1 | A | c 9 | f | A 17 | d 6 | g 14 | b 14 | e | g |
3 | c | f 9 | f | b 9 | d | g 17 | b 6 | e | A 3 | c 3 | f 11 | A 11 |
4 | d 9 | g | g 9 | c | e 17 | A 6 | c | f 14 | b | d | g | b 19 |
5 | e P2 | A 17 | A | d 17 | f 6 | b | d 14 | g 3 | c 11 | e 11 | A 19 | c |
6 | f 17 | b 6 | b 17 | e 6 | g | c 14 | e 3 | A | d | f | b 8 | d 8 |
7 | g 6 | c | c 6 | f | A 14 | d 3 | f | b 11 | e 19 | g 19 | c Em | e 16 |
8 | A | d 14 | d | g 14 | b 3 | e | g 11 | c | f 8 | A 8 | d 16 | f 5 |
9 | b 14 | e 3 | e 14 | A 3 | c | f 11 | A | d 19 | g Ca | b 16 | e 5 | g |
10 | c 3 | f | f 3 | b | d 11 | g | b 19 | e 8 | A 16 | c 5 | f | A 13 |
11 | d | g 11 | g | c 11 | e | A 19 | c 8 | f 16 | b 5 | d | g 13 | b 2 |
12 | e 11 | A | A 11 | d | f 19 | b 8 | d vii | g 5 | c | e 13 | A 2 | c |
13 | f | b 19 | b | e 19 | g 8 | c 16 | e 16 | A | d 13 | f 2 | b | d 10 |
14 | g 19 | c 8 | c 19 | f 8 | A El | d 5 | f 5 | b 13 | e 2 | g | c 10 | e |
15 | A 8 | d 16 | d 8 | g 16 | b 16 | e | g | c 2 | f | A 10 | d | f 18 |
16 | b Ha | e 5 | e Mi | A 5 | c 5 | f 13 | A 13 | d | g 10 | b | e 18 | g 7 |
17 | c 16 | f | f 16 | b | d | g 2 | b 2 | e 10 | A | c 18 | f 7 | A |
18 | d 5 | g 13 | g 5 | c 13 | e 13 | A | c | f | b 18 | d 7 | g | b 15 |
19 | e | A 2 | A | d 2 | f 2 | b 10 | d 10 | g 18 | c 7 | e | A 15 | c 4 |
20 | f 13 | b | b 13 | e | g | c | e | A 7 | d | f 15 | b 4 | d |
21 | g 2 | c 10 | c 2 | f 10 | A 10 | d 18 | f 18 | b | e 15 | g 4 | c | e 12 |
22 | A | d | d | g | b | e 7 | g 7 | c 15 | f 4 | A | d 12 | f 1 |
23 | b 10 | e 18 | e 10 | A 18 | c 18 | f | A | d 4 | g | b 12 | e 1 | g |
24 | c | f 7 | f | b 7 | d 7 | g 15 | b 15 | e | A 12 | c 1 | f | A 9 |
25 | d 18 | g | g 18 | c | e | A 4 | c 4 | f 12 | b 1 | d | g 9 | b |
26 | e 7 | A 15 | A 7 | d 15 | f 15 | b | d | g 1 | c | e 9 | A | c 17 |
27 | f | b 4 | b | e 4 | g 4 | c 12 | e 12 | A | d 9 | f | b 17 | d 6 |
28 | g 15 | c | c 15 | f | A | d 1 | f 1 | b 9 | e | g 17 | c 6 | e |
29 | A 4 | d 4 | g 12 | b 12 | e | g | c | f 17 | A 6 | d | f 14 | |
30 | b | e | A 1 | c 1 | f 9 | A 9 | d 17 | g 6 | b | e 14 | g 3 | |
31 | c 12 | f 12 | d | b | e 6 | c 14 | A | |||||
Harr | Ron | Miri | Jame | Eloi | Thom | vii | Nich | Cath | Rich | Emma | Paul |
The calendar may be used to locate the approximate position of the moon at any time. There are innumerable applications.
The "establishment" of a port is approximately the time between the moon's meridian passage (above and below the horizon) and high water. Tidal range is greatest in the middle and at the end of the lunar month ("spring tides") and at the equinoxes. For accurate predictions use official tables. An example calculation follows.
It is 9 PM Greenwich Mean Time in London on 15 February 2024. The golden number is 11, which is printed against 11 February. This is the lunar new year (1 Harriet) and 15 February is therefore 5 Harriet. At the end of the previous month (as at the end of every lunar month) the sun and moon are together in the sky, but the lunar day is on average 4/5 hour longer than the solar day. Thus at 9 PM it is only 5 PM by the moon. Whether the moon is visible at that time may be determined using the fact that the moon moves through the zodiac at the rate of 13.2° per day (compared to 1° per day for the sun). On 15 February (5 Harriet) the moon will have advanced (5 x (13.2 - 1)) = 5 x 12.2 = about 61° ahead of the sun. So it will be where the sun will be about 61 days later, i.e. around 16 April.
But there is another factor. The moon's ascending node (where the plane of its orbit crosses the ecliptic in a northerly direction) moves backwards, completing a circuit relative to the equinox in 18.6 years. When the longitude is 0° (which it will reach around 29 January 2025) it reaches a maximum of 5° further from the celestial equator than does the sun (the major standstill). Half a revolution later (the minor standstill) it reaches a maximum of 5° nearer to the celestial equator than does the sun.
So considering the moon's position at 9 PM on 15 February 2024 we look where the sun would be at 5 PM on 16 April and (since the date is fairly close to the major standstill) a little higher in the sky. The moon was thus looked for (and was seen) high in the west.
The calendar may be used to predict eclipses. As the node revolves through 360° in 18.6 years, each month it will retrograde about ((360/18.6)/12)° = 1.61°. As the ascending node reaches 0° around 29 January 2025, in September 2024 its longitude is around 6° and the descending node (directly opposite) is around 186°. The sun reaches ecliptic longitude 186° around 30 September. There will be a lunar eclipse if the full moon (usually on the 14th of the lunar month) occurs within 13 days either side of the sun passing through either node. For solar eclipses (at the end of the lunar month) the "eclipse season" is 19 days either side of the sun's passage through a node. The nearer to the node the sun is the greater the eclipse will be. In 2024, 14 Nicholas corresponds to 18 September. As this is just within the eclipse season there will be a small partial eclipse. This reaches a maximum at 02:44 GMT when 8.5% of the disc is obscured. On 28 Nicholas, when the sun is very close to the node, the annular solar eclipse of October 2, 2024 occurs. If the solar eclipse occurs within 11 days either side of the sun passing through the node (as here) it will be central (total or annular). As the "eclipse season" is longer than a lunar month there will always be at least one eclipse every time the sun passes through a node, which it does on average every 173.2979 days
As virtually all religions use lunar calendars, the calendar aids in planning rest days in for example conferences attended by members of different faiths. The Jewish Passover almost always occurs during Miri, and the High Holy Days almost always occur during Catherine.
Source: International Commission for Anglican-Orthodox Theological Dialogue (Metropolitan Athenagoras of Belgium, The Rt Revd Graham Usher, Bishop of Norwich), The prospect of Whitby (2022, 22 pp.) Norwich Cathedral Library, Norwich, Norfolk, England.
Other Judeo-Christian eras
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