| Solar eclipse of October 21, 1930 | |
|---|---|
 Map | |
| Type of eclipse | |
| Nature | Total |
| Gamma | −0.3804 |
| Magnitude | 1.023 |
| Maximum eclipse | |
| Duration | 115 s (1 min 55 s) |
| Coordinates | 30°30′S 161°06′W / 30.5°S 161.1°W |
| Max. width of band | 84 km (52 mi) |
| Times (UTC) | |
| Greatest eclipse | 21:43:53 |
| References | |
| Saros | 142 (18 of 72) |
| Catalog # (SE5000) | 9352 |
A total solar eclipse occurred on October 21, 1930. 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. Totality was visible from Niuafoʻou in Tonga, Chile, and a tiny part of Santa Cruz Province, Argentina.
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]
| Solar eclipse series sets from 1928 to 1931 | ||||
|---|---|---|---|---|
| Ascending node | Descending node | |||
| 117 | May 19, 1928 Total (non-central) |
122 | November 12, 1928 Partial | |
| 127 | May 9, 1929 Total |
132 | November 1, 1929 Annular | |
| 137 | April 28, 1930 Hybrid |
142 | October 21, 1930 Total | |
| 147 | April 18, 1931 Partial |
152 | October 11, 1931 Partial | |
It is a part of Saros cycle 142, repeating every 18 years, 11 days, containing 72 events. The series started with partial solar eclipse on April 17, 1624. It contains one hybrid eclipse on July 14, 1768, and total eclipses from July 25, 1786 through October 29, 2543. The series ends at member 72 as a partial eclipse on June 5, 2904. The longest duration of totality will be 6 minutes, 34 seconds on May 28, 2291. All eclipses in this series occurs at the Moon’s descending node.[2]
| Series members 17–41 occur between 1901 and 2359 | ||
|---|---|---|
| 17 | 18 | 19 |
 October 10, 1912 |
October 21, 1930 |
 November 1, 1948 |
| 20 | 21 | 22 |
 November 12, 1966 |
 November 22, 1984 |
 December 4, 2002 |
| 23 | 24 | 25 |
 December 14, 2020 |
 December 26, 2038 |
 January 5, 2057 |
| 26 | 27 | 28 |
 January 16, 2075 |
 January 27, 2093 |
 February 8, 2111 |
| 29 | 30 | 31 |
 February 18, 2129 |
 March 2, 2147 |
 March 12, 2165 |
| 32 | 33 | 34 |
 March 23, 2183 |
 April 4, 2201 |
 April 15, 2219 |
| 35 | 36 | 37 |
 April 25, 2237 |
 May 7, 2255 |
 May 17, 2273 |
| 38 | 39 | 40 |
 May 28, 2291 |
 June 9, 2309 |
 June 20, 2327 |
| 41 | ||
 June 30, 2345 | ||
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.
| Inex series members between 1901 and 2100: | ||
|---|---|---|
 November 11, 1901 (Saros 141) |
October 21, 1930 (Saros 142) |
 October 2, 1959 (Saros 143) |
 September 11, 1988 (Saros 144) |
 August 21, 2017 (Saros 145) |
 August 2, 2046 (Saros 146) |
 July 13, 2075 (Saros 147) |
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