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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, February 25, 1971,[1] with a magnitude of 0.7872. 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 and Europe.
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 | 1971 February 25 at 07:49:28.7 UTC |
| Greatest Eclipse | 1971 February 25 at 09:38:07.1 UTC |
| Ecliptic Conjunction | 1971 February 25 at 09:49:14.7 UTC |
| Equatorial Conjunction | 1971 February 25 at 10:37:14.9 UTC |
| Last Penumbral External Contact | 1971 February 25 at 11:26:20.3 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.78718 |
| Eclipse Obscuration | 0.73865 |
| Gamma | 1.11876 |
| Sun Right Ascension | 22h31m38.2s |
| Sun Declination | -09°15'46.7" |
| Sun Semi-Diameter | 16'09.4" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 22h29m32.0s |
| Moon Declination | -08°14'50.7" |
| Moon Semi-Diameter | 16'42.7" |
| Moon Equatorial Horizontal Parallax | 1°01'19.9" |
| ΔT | 41.3 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.
| February 10 Descending node (full moon) | February 25 Ascending node (new moon) |
|---|---|
 | |
| Total lunar eclipse Lunar Saros 123 | Partial solar eclipse Solar Saros 149 |
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 eclipse on July 22, 1971 occurs in the next lunar year eclipse set.
| Solar eclipse series sets from 1968 to 1971 | ||||||
|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 119 | March 28, 1968 Partial |
−1.037 | 124 | September 22, 1968 Total |
0.9451 | |
| 129 | March 18, 1969 Annular |
−0.2704 | 134 | September 11, 1969 Annular |
0.2201 | |
139.jpg) Totality in Williamston, NC USA |
March 7, 1970 Total |
0.4473 | 144 | August 31, 1970 Annular |
−0.5364 | |
| 149 | February 25, 1971 Partial |
1.1188 | 154 | August 20, 1971 Partial |
−1.2659 | |
This eclipse is a part of Saros series 149, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on August 21, 1664. It contains total eclipses from April 9, 2043 through October 2, 2331; hybrid eclipses from October 13, 2349 through November 3, 2385; and annular eclipses from November 15, 2403 through July 13, 2800. The series ends at member 71 as a partial eclipse on September 28, 2926. 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 will be produced by member 31 at 4 minutes, 10 seconds on July 17, 2205, and the longest duration of annularity will be produced by member 62 at 5 minutes, 6 seconds on June 21, 2764. All eclipses in this series occur at the Moon’s ascending node of orbit.[4]
| Series members 9–30 occur between 1801 and 2200: | ||
|---|---|---|
| 9 | 10 | 11 |
 November 18, 1808 |
 November 29, 1826 |
 December 9, 1844 |
| 12 | 13 | 14 |
 December 21, 1862 |
 December 31, 1880 |
 January 11, 1899 |
| 15 | 16 | 17 |
 January 23, 1917 |
 February 3, 1935 |
 February 14, 1953 |
| 18 | 19 | 20 |
February 25, 1971 |
 March 7, 1989 |
 March 19, 2007 |
| 21 | 22 | 23 |
 March 29, 2025 |
 April 9, 2043 |
 April 20, 2061 |
| 24 | 25 | 26 |
 May 1, 2079 |
 May 11, 2097 |
 May 24, 2115 |
| 27 | 28 | 29 |
 June 3, 2133 |
 June 14, 2151 |
 June 25, 2169 |
| 30 | ||
 July 6, 2187 | ||
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 13, 1898 and July 20, 1982 | ||||
|---|---|---|---|---|
| December 13–14 | October 1–2 | July 20–21 | May 9 | February 24–25 |
| 111 | 113 | 115 | 117 | 119 |
 December 13, 1898 |
 July 21, 1906 |
 May 9, 1910 |
 February 25, 1914 | |
| 121 | 123 | 125 | 127 | 129 |
 December 14, 1917 |
 October 1, 1921 |
 July 20, 1925 |
 May 9, 1929 |
 February 24, 1933 |
| 131 | 133 | 135 | 137 | 139 |
 December 13, 1936 |
 October 1, 1940 |
 July 20, 1944 |
 May 9, 1948 |
 February 25, 1952 |
| 141 | 143 | 145 | 147 | 149 |
 December 14, 1955 |
 October 2, 1959 |
 July 20, 1963 |
 May 9, 1967 |
February 25, 1971 |
| 151 | 153 | 155 | ||
 December 13, 1974 |
 October 2, 1978 |
 July 20, 1982 | ||
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 | ||
|---|---|---|
 June 5, 1826 (Saros 144) |
 May 16, 1855 (Saros 145) |
 April 25, 1884 (Saros 146) |
 April 6, 1913 (Saros 147) |
 March 16, 1942 (Saros 148) |
February 25, 1971 (Saros 149) |
 February 5, 2000 (Saros 150) |
 January 14, 2029 (Saros 151) |
 December 26, 2057 (Saros 152) |
 December 6, 2086 (Saros 153) |
 November 16, 2115 (Saros 154) |
 October 26, 2144 (Saros 155) |
 October 7, 2173 (Saros 156) |
||
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