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20th-century partial solar eclipse From Wikipedia, the free encyclopedia
A partial solar eclipse occurred at the Moon's descending node of orbit between Thursday, December 3 and Friday, December 4, 1964,[1] with a magnitude of 0.7518. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.
This was the last of four partial solar eclipses in 1964, with the others occurring on January 14, June 10, and July 9.
A partial eclipse was visible for parts of Northeast Asia, southwest Alaska, and Hawaii.
Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[2]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1964 December 03 at 23:21:15.6 UTC |
| Equatorial Conjunction | 1964 December 04 at 01:00:31.0 UTC |
| Ecliptic Conjunction | 1964 December 04 at 01:18:47.3 UTC |
| Greatest Eclipse | 1964 December 04 at 01:31:54.2 UTC |
| Last Penumbral External Contact | 1964 December 04 at 03:42:48.7 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.75179 |
| Eclipse Obscuration | 0.66267 |
| Gamma | 1.11929 |
| Sun Right Ascension | 16h41m43.6s |
| Sun Declination | -22°13'30.4" |
| Sun Semi-Diameter | 16'13.7" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 16h42m43.4s |
| Moon Declination | -21°14'34.6" |
| Moon Semi-Diameter | 14'46.7" |
| Moon Equatorial Horizontal Parallax | 0°54'14.3" |
| ΔT | 35.7 s |
This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.
| December 4 Descending node (new moon) | December 19 Ascending node (full moon) |
|---|---|
|  |
| Partial solar eclipse Solar Saros 122 | Total lunar eclipse Lunar Saros 134 |
This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[3]
The partial solar eclipses on January 14, 1964 and July 9, 1964 occur in the previous lunar year eclipse set.
| Solar eclipse series sets from 1964 to 1967 | ||||||
|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 117 | June 10, 1964 Partial |
−1.1393 | 122 | December 4, 1964 Partial |
1.1193 | |
| 127 | May 30, 1965 Total |
−0.4225 | 132 | November 23, 1965 Annular |
0.3906 | |
| 137 | May 20, 1966 Annular |
0.3467 | 142 | November 12, 1966 Total |
−0.33 | |
| 147 | May 9, 1967 Partial |
1.1422 | 152 | November 2, 1967 Total (non-central) |
1.0007 | |
This eclipse is a part of Saros series 122, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on April 17, 991 AD. It contains total eclipses from July 12, 1135 through August 3, 1171; hybrid eclipses on August 13, 1189 and August 25, 1207; and annular eclipses from September 4, 1225 through October 10, 1874. The series ends at member 70 as a partial eclipse on May 17, 2235. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
The longest duration of totality was produced by member 9 at 1 minutes, 25 seconds on July 12, 1135, and the longest duration of annularity was produced by member 50 at 6 minutes, 28 seconds on October 10, 1874. All eclipses in this series occur at the Moon’s descending node of orbit.[4]
| Series members 46–68 occur between 1801 and 2200: | ||
|---|---|---|
| 46 | 47 | 48 |
 August 28, 1802 |
 September 7, 1820 |
 September 18, 1838 |
| 49 | 50 | 51 |
 September 29, 1856 |
 October 10, 1874 |
 October 20, 1892 |
| 52 | 53 | 54 |
 November 2, 1910 |
 November 12, 1928 |
 November 23, 1946 |
| 55 | 56 | 57 |
December 4, 1964 |
 December 15, 1982 |
 December 25, 2000 |
| 58 | 59 | 60 |
 January 6, 2019 |
 January 16, 2037 |
 January 27, 2055 |
| 61 | 62 | 63 |
 February 7, 2073 |
 February 18, 2091 |
 March 1, 2109 |
| 64 | 65 | 66 |
 March 13, 2127 |
 March 23, 2145 |
 April 3, 2163 |
| 67 | 68 | |
 April 14, 2181 |
 April 25, 2199 | |
The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's descending node.
| 21 eclipse events between July 11, 1953 and July 11, 2029 | ||||
|---|---|---|---|---|
| July 10–11 | April 29–30 | February 15–16 | December 4 | September 21–23 |
| 116 | 118 | 120 | 122 | 124 |
 July 11, 1953 |
 April 30, 1957 |
 February 15, 1961 |
December 4, 1964 |
 September 22, 1968 |
| 126 | 128 | 130 | 132 | 134 |
 July 10, 1972 |
 April 29, 1976 |
 February 16, 1980 |
 December 4, 1983 |
 September 23, 1987 |
| 136 | 138 | 140 | 142 | 144 |
 July 11, 1991 |
 April 29, 1995 |
 February 16, 1999 |
 December 4, 2002 |
 September 22, 2006 |
| 146 | 148 | 150 | 152 | 154 |
 July 11, 2010 |
 April 29, 2014 |
 February 15, 2018 |
 December 4, 2021 |
 September 21, 2025 |
| 156 | ||||
 July 11, 2029 | ||||
This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | ||||
|---|---|---|---|---|
 March 14, 1801 (Saros 107) |
 February 12, 1812 (Saros 108) |
 January 12, 1823 (Saros 109) |
 November 10, 1844 (Saros 111) | |
 August 9, 1877 (Saros 114) |
 July 9, 1888 (Saros 115) |
 June 8, 1899 (Saros 116) | ||
 May 9, 1910 (Saros 117) |
 April 8, 1921 (Saros 118) |
 March 7, 1932 (Saros 119) |
 February 4, 1943 (Saros 120) |
 January 5, 1954 (Saros 121) |
December 4, 1964 (Saros 122) |
 November 3, 1975 (Saros 123) |
 October 3, 1986 (Saros 124) |
 September 2, 1997 (Saros 125) |
 August 1, 2008 (Saros 126) |
 July 2, 2019 (Saros 127) |
 June 1, 2030 (Saros 128) |
 April 30, 2041 (Saros 129) |
 March 30, 2052 (Saros 130) |
 February 28, 2063 (Saros 131) |
 January 27, 2074 (Saros 132) |
 December 27, 2084 (Saros 133) |
 November 27, 2095 (Saros 134) |
 October 26, 2106 (Saros 135) |
 September 26, 2117 (Saros 136) |
 August 25, 2128 (Saros 137) |
 July 25, 2139 (Saros 138) |
 June 25, 2150 (Saros 139) |
 May 25, 2161 (Saros 140) |
 April 23, 2172 (Saros 141) |
 March 23, 2183 (Saros 142) |
 February 21, 2194 (Saros 143) | |||
This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | ||
|---|---|---|
 March 14, 1820 (Saros 117) |
 February 23, 1849 (Saros 118) |
 February 2, 1878 (Saros 119) |
 January 14, 1907 (Saros 120) |
 December 25, 1935 (Saros 121) |
December 4, 1964 (Saros 122) |
 November 13, 1993 (Saros 123) |
 October 25, 2022 (Saros 124) |
 October 4, 2051 (Saros 125) |
 September 13, 2080 (Saros 126) |
 August 26, 2109 (Saros 127) |
 August 5, 2138 (Saros 128) |
 July 16, 2167 (Saros 129) |
 June 26, 2196 (Saros 130) |
|
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