| Solar eclipse of May 18, 1920 | |
|---|---|
 Map | |
| Type of eclipse | |
| Nature | Partial |
| Gamma | −1.0239 |
| Magnitude | 0.9734 |
| Maximum eclipse | |
| Coordinates | 69°06′S 107°42′E / 69.1°S 107.7°E / -69.1; 107.7 |
| Times (UTC) | |
| Greatest eclipse | 6:14:55 |
| References | |
| Saros | 146 (22 of 76) |
| Catalog # (SE5000) | 9328 |
A partial solar eclipse occurred at the Moon's descending node of orbit on Tuesday, May 18, 1920, with a magnitude of 0.9734. 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 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.[1]
The solar eclipses on February 3, 1916 (total), July 30, 1916 (annular), January 23, 1917 (partial), and July 19, 1917 (partial) occur in the previous lunar year eclipse set.
| Solar eclipse series sets from 1916 to 1920 | ||||||
|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 111 | December 24, 1916 Partial |
−1.5321 | 116 | June 19, 1917 Partial |
1.2857 | |
| 121 | December 14, 1917 Annular |
−0.9157 | 126 | June 8, 1918 Total |
0.4658 | |
| 131 | December 3, 1918 Annular |
−0.2387 | 136 Totality in Príncipe |
May 29, 1919 Total |
−0.2955 | |
| 141 | November 22, 1919 Annular |
0.4549 | 146 | May 18, 1920 Partial |
−1.0239 | |
| 151 | November 10, 1920 Partial |
1.1287 | ||||
This eclipse is a part of Saros series 146, repeating every 18 years, 11 days, and containing 76 events. The series started with a partial solar eclipse on September 19, 1541. It contains total eclipses from May 29, 1938 through October 7, 2154; hybrid eclipses from October 17, 2172 through November 20, 2226; and annular eclipses from November 30, 2244 through August 10, 2659. The series ends at member 76 as a partial eclipse on December 29, 2893. 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 26 at 5 minutes, 21 seconds on June 30, 1992, and the longest duration of annularity will be produced by member 63 at 3 minutes, 30 seconds on August 10, 2659. All eclipses in this series occur at the Moon’s descending node of orbit.[2]
| Series members 16–37 occur between 1801 and 2200: | ||
|---|---|---|
| 16 | 17 | 18 |
 March 13, 1812 |
 March 24, 1830 |
 April 3, 1848 |
| 19 | 20 | 21 |
 April 15, 1866 |
 April 25, 1884 |
 May 7, 1902 |
| 22 | 23 | 24 |
May 18, 1920 |
 May 29, 1938 |
 June 8, 1956 |
| 25 | 26 | 27 |
 June 20, 1974 |
 June 30, 1992 |
 July 11, 2010 |
| 28 | 29 | 30 |
 July 22, 2028 |
 August 2, 2046 |
 August 12, 2064 |
| 31 | 32 | 33 |
 August 24, 2082 |
 September 4, 2100 |
 September 15, 2118 |
| 34 | 35 | 36 |
 September 26, 2136 |
 October 7, 2154 |
 October 17, 2172 |
| 37 | ||
 October 29, 2190 | ||
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.
| 22 eclipse events between March 5, 1848 and July 30, 1935 | ||||
|---|---|---|---|---|
| March 5–6 | December 22–24 | October 9–11 | July 29–30 | May 17–18 |
| 108 | 110 | 112 | 114 | 116 |
 March 5, 1848 |
 July 29, 1859 |
 May 17, 1863 | ||
| 118 | 120 | 122 | 124 | 126 |
 March 6, 1867 |
 December 22, 1870 |
 October 10, 1874 |
 July 29, 1878 |
 May 17, 1882 |
| 128 | 130 | 132 | 134 | 136 |
 March 5, 1886 |
 December 22, 1889 |
 October 9, 1893 |
 July 29, 1897 |
 May 18, 1901 |
| 138 | 140 | 142 | 144 | 146 |
 March 6, 1905 |
 December 23, 1908 |
 October 10, 1912 |
 July 30, 1916 |
May 18, 1920 |
| 148 | 150 | 152 | 154 | |
 March 5, 1924 |
 December 24, 1927 |
 October 11, 1931 |
 July 30, 1935 | |
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