| Solar eclipse of October 1, 1921 | |
|---|---|
 Map | |
| Type of eclipse | |
| Nature | Total |
| Gamma | −0.9383 |
| Magnitude | 1.0293 |
| Maximum eclipse | |
| Duration | 112 s (1 min 52 s) |
| Coordinates | 66°06′S 56°06′W / 66.1°S 56.1°W / -66.1; -56.1 |
| Max. width of band | 291 km (181 mi) |
| Times (UTC) | |
| Greatest eclipse | 12:35:58 |
| References | |
| Saros | 123 (48 of 70) |
| Catalog # (SE5000) | 9331 |
A total solar eclipse occurred at the Moon's ascending node of orbit on Saturday, October 1, 1921, with a magnitude of 1.0293. 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 total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide.
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 partial solar eclipse on July 31, 1924 occurs in the next lunar year eclipse set.
| Solar eclipse series sets from 1921 to 1924 | ||||||
|---|---|---|---|---|---|---|
| Descending node | Ascending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 118 | April 8, 1921 Annular |
0.8869 | 123 | October 1, 1921 Total |
−0.9383 | |
| 128 | March 28, 1922 Annular |
0.1711 | 133 | September 21, 1922 Total |
−0.213 | |
| 138 | March 17, 1923 Annular |
−0.5438 | 143 | September 10, 1923 Total |
0.5149 | |
| 148 | March 5, 1924 Partial |
−1.2232 | 153 | August 30, 1924 Partial |
1.3123 | |
This eclipse is a part of Saros series 123, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on April 29, 1074. It contains annular eclipses from July 2, 1182 through April 19, 1651; hybrid eclipses from April 30, 1669 through May 22, 1705; and total eclipses from June 3, 1723 through October 23, 1957. The series ends at member 70 as a partial eclipse on May 31, 2318. 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 was produced by member 19 at 8 minutes, 7 seconds on November 9, 1398, and the longest duration of totality was produced by member 42 at 3 minutes, 27 seconds on July 27, 1813. All eclipses in this series occur at the Moon’s ascending node of orbit.[2]
| Series members 42–63 occur between 1801 and 2200: | ||
|---|---|---|
| 42 | 43 | 44 |
 July 27, 1813 |
 August 7, 1831 |
 August 18, 1849 |
| 45 | 46 | 47 |
 August 29, 1867 |
 September 8, 1885 |
 September 21, 1903 |
| 48 | 49 | 50 |
October 1, 1921 |
 October 12, 1939 |
 October 23, 1957 |
| 51 | 52 | 53 |
 November 3, 1975 |
 November 13, 1993 |
 November 25, 2011 |
| 54 | 55 | 56 |
 December 5, 2029 |
 December 16, 2047 |
 December 27, 2065 |
| 57 | 58 | 59 |
 January 7, 2084 |
 January 19, 2102 |
 January 30, 2120 |
| 60 | 61 | 62 |
 February 9, 2138 |
 February 21, 2156 |
 March 3, 2174 |
| 63 | ||
 March 13, 2192 | ||
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).
| 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 | ||
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