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20th-century partial solar eclipse From Wikipedia, the free encyclopedia
A partial solar eclipse occurred at the Moon's ascending node of orbit on Thursday, April 28, 1949,[1] with a magnitude of 0.6092. 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.
A partial eclipse was visible for parts of North Africa, Europe, the Soviet Union, Greenland, and northern Canada.
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 | 1949 April 28 at 05:52:15.3 UTC |
| Greatest Eclipse | 1949 April 28 at 07:48:53.1 UTC |
| Ecliptic Conjunction | 1949 April 28 at 08:02:42.0 UTC |
| Equatorial Conjunction | 1949 April 28 at 08:53:20.8 UTC |
| Last Penumbral External Contact | 1949 April 28 at 09:45:01.2 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.60918 |
| Eclipse Obscuration | 0.50435 |
| Gamma | 1.20682 |
| Sun Right Ascension | 02h21m19.3s |
| Sun Declination | +14°04'51.6" |
| Sun Semi-Diameter | 15'52.9" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 02h19m26.3s |
| Moon Declination | +15°04'38.0" |
| Moon Semi-Diameter | 14'52.8" |
| Moon Equatorial Horizontal Parallax | 0°54'36.6" |
| ΔT | 28.9 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.
| April 13 Descending node (full moon) | April 28 Ascending node (new moon) |
|---|---|
 | |
| Total lunar eclipse Lunar Saros 121 | Partial solar eclipse Solar Saros 147 |
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 3, 1946 and June 29, 1946 occur in the previous lunar year eclipse set.
| Solar eclipse series sets from 1946 to 1949 | ||||||
|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 117 | May 30, 1946 Partial |
−1.0711 | 122 | November 23, 1946 Partial |
1.105 | |
| 127 | May 20, 1947 Total |
−0.3528 | 132 | November 12, 1947 Annular |
0.3743 | |
| 137 | May 9, 1948 Annular |
0.4133 | 142 | November 1, 1948 Total |
−0.3517 | |
| 147 | April 28, 1949 Partial |
1.2068 | 152 | October 21, 1949 Partial |
−1.027 | |
This eclipse is a part of Saros series 147, repeating every 18 years, 11 days, and containing 80 events. The series started with a partial solar eclipse on October 12, 1624. It contains annular eclipses from May 31, 2003 through July 31, 2706. There are no hybrid or total eclipses in this set. The series ends at member 80 as a partial eclipse on February 24, 3049. 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 annularity will be produced by member 38 at 9 minutes, 41 seconds on November 21, 2291. All eclipses in this series occur at the Moon’s ascending node of orbit.[4]
| Series members 11–32 occur between 1801 and 2200: | ||
|---|---|---|
| 11 | 12 | 13 |
 January 30, 1805 |
 February 11, 1823 |
 February 21, 1841 |
| 14 | 15 | 16 |
 March 4, 1859 |
 March 15, 1877 |
 March 26, 1895 |
| 17 | 18 | 19 |
 April 6, 1913 |
 April 18, 1931 |
April 28, 1949 |
| 20 | 21 | 22 |
 May 9, 1967 |
 May 19, 1985 |
 May 31, 2003 |
| 23 | 24 | 25 |
 June 10, 2021 |
 June 21, 2039 |
 July 1, 2057 |
| 26 | 27 | 28 |
 July 13, 2075 |
 July 23, 2093 |
 August 4, 2111 |
| 29 | 30 | 31 |
 August 15, 2129 |
 August 26, 2147 |
 September 5, 2165 |
| 32 | ||
 September 16, 2183 | ||
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 ascending node.
| 22 eclipse events between December 2, 1880 and July 9, 1964 | ||||
|---|---|---|---|---|
| December 2–3 | September 20–21 | July 9–10 | April 26–28 | February 13–14 |
| 111 | 113 | 115 | 117 | 119 |
 December 2, 1880 |
 July 9, 1888 |
 April 26, 1892 |
 February 13, 1896 | |
| 121 | 123 | 125 | 127 | 129 |
 December 3, 1899 |
 September 21, 1903 |
 July 10, 1907 |
 April 28, 1911 |
 February 14, 1915 |
| 131 | 133 | 135 | 137 | 139 |
 December 3, 1918 |
 September 21, 1922 |
 July 9, 1926 |
 April 28, 1930 |
 February 14, 1934 |
| 141 | 143 | 145 | 147 | 149 |
 December 2, 1937 |
 September 21, 1941 |
 July 9, 1945 |
April 28, 1949 |
 February 14, 1953 |
| 151 | 153 | 155 | ||
 December 2, 1956 |
 September 20, 1960 |
 July 9, 1964 | ||
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.
The partial solar eclipses on November 16, 2134 (part of Saros 164) and October 16, 2145 (part of Saros 165) are also a part of this series but are not included in the table below.
| Series members between 1801 and 2069 | ||||
|---|---|---|---|---|
 June 6, 1807 (Saros 134) |
 May 5, 1818 (Saros 135) |
 April 3, 1829 (Saros 136) |
 March 4, 1840 (Saros 137) |
 February 1, 1851 (Saros 138) |
 December 31, 1861 (Saros 139) |
 November 30, 1872 (Saros 140) |
 October 30, 1883 (Saros 141) |
 September 29, 1894 (Saros 142) |
 August 30, 1905 (Saros 143) |
 July 30, 1916 (Saros 144) |
 June 29, 1927 (Saros 145) |
 May 29, 1938 (Saros 146) |
April 28, 1949 (Saros 147) |
 March 27, 1960 (Saros 148) |
 February 25, 1971 (Saros 149) |
 January 25, 1982 (Saros 150) |
 December 24, 1992 (Saros 151) |
 November 23, 2003 (Saros 152) |
 October 23, 2014 (Saros 153) |
 September 21, 2025 (Saros 154) |
 August 21, 2036 (Saros 155) |
 July 22, 2047 (Saros 156) |
 June 21, 2058 (Saros 157) |
 May 20, 2069 (Saros 158) |
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 | ||
|---|---|---|
 August 5, 1804 (Saros 142) |
 July 17, 1833 (Saros 143) |
 June 27, 1862 (Saros 144) |
 June 6, 1891 (Saros 145) |
 May 18, 1920 (Saros 146) |
April 28, 1949 (Saros 147) |
 April 7, 1978 (Saros 148) |
 March 19, 2007 (Saros 149) |
 February 27, 2036 (Saros 150) |
 February 5, 2065 (Saros 151) |
 January 16, 2094 (Saros 152) |
 December 28, 2122 (Saros 153) |
 December 8, 2151 (Saros 154) |
 November 17, 2180 (Saros 155) |
|
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