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Solar eclipse of October 11, 1931

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Solar eclipse of October 11, 1931
Map
Type of eclipse
NaturePartial
Gamma−1.0607
Magnitude0.9005
Maximum eclipse
Coordinates61°12′S 119°30′W / 61.2°S 119.5°W / -61.2; -119.5
Times (UTC)
Greatest eclipse12:55:40
References
Saros152 (8 of 70)
Catalog # (SE5000)9354

A partial solar eclipse occurred at the Moon's descending node of orbit on Sunday, October 11, 1931,[1] with a magnitude of 0.9005. 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 southern and central South America and Antarctica.

Eclipse details

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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]

October 11, 1931 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1931 October 11 at 11:01:29.3 UTC
Greatest Eclipse 1931 October 11 at 12:55:39.8 UTC
Ecliptic Conjunction 1931 October 11 at 13:06:15.3 UTC
Equatorial Conjunction 1931 October 11 at 13:53:48.2 UTC
Last Penumbral External Contact 1931 October 11 at 14:49:27.7 UTC
October 11, 1931 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.90054
Eclipse Obscuration 0.88440
Gamma −1.06069
Sun Right Ascension 13h03m34.8s
Sun Declination -06°46'31.5"
Sun Semi-Diameter 16'01.4"
Sun Equatorial Horizontal Parallax 08.8"
Moon Right Ascension 13h01m31.6s
Moon Declination -07°43'48.4"
Moon Semi-Diameter 16'43.0"
Moon Equatorial Horizontal Parallax 1°01'21.2"
ΔT 23.9 s

Eclipse season

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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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of September–October 1931
September 12
Descending node (new moon)
September 26
Ascending node (full moon)
October 11
Descending node (new moon)
Partial solar eclipse
Solar Saros 114
Total lunar eclipse
Lunar Saros 126
Partial solar eclipse
Solar Saros 152
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Eclipses in 1931

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Solar Saros 152

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Inex

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Triad

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Solar eclipses of 1928–1931

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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 June 17, 1928 occurs in the previous lunar year eclipse set, and the partial solar eclipse on September 12, 1931 occurs in the next lunar year eclipse set.

Solar eclipse series sets from 1928 to 1931
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
117 May 19, 1928

Total (non-central)
1.0048 122 November 12, 1928

Partial
1.0861
127 May 9, 1929

Total
−0.2887 132 November 1, 1929

Annular
0.3514
137 April 28, 1930

Hybrid
0.473 142 October 21, 1930

Total
−0.3804
147 April 18, 1931

Partial
1.2643 152 October 11, 1931

Partial
−1.0607

Saros 152

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This eclipse is a part of Saros series 152, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on July 26, 1805. It contains total eclipses from November 2, 1967 through September 14, 2490; hybrid eclipses from September 26, 2508 through October 17, 2544; and annular eclipses from October 29, 2562 through June 16, 2941. The series ends at member 70 as a partial eclipse on August 20, 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 totality will be produced by member 30 at 5 minutes, 16 seconds on June 9, 2328, and the longest duration of annularity will be produced by member 53 at 5 minutes, 20 seconds on February 16, 2743. All eclipses in this series occur at the Moon’s descending node of orbit.[4]

Series members 1–22 occur between 1805 and 2200:
1 2 3

July 26, 1805

August 6, 1823

August 16, 1841
4 5 6

August 28, 1859

September 7, 1877

September 18, 1895
7 8 9

September 30, 1913

October 11, 1931

October 21, 1949
10 11 12

November 2, 1967

November 12, 1985

November 23, 2003
13 14 15

December 4, 2021

December 15, 2039

December 26, 2057
16 17 18

January 6, 2076

January 16, 2094

January 29, 2112
19 20 21

February 8, 2130

February 19, 2148

March 2, 2166
22

March 12, 2184

Metonic series

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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

Tritos series

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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.

Series members between 1801 and 1964

September 17, 1811
(Saros 141)

August 16, 1822
(Saros 142)

July 17, 1833
(Saros 143)

June 16, 1844
(Saros 144)

May 16, 1855
(Saros 145)

April 15, 1866
(Saros 146)

March 15, 1877
(Saros 147)

February 11, 1888
(Saros 148)

January 11, 1899
(Saros 149)

December 12, 1909
(Saros 150)

November 10, 1920
(Saros 151)

October 11, 1931
(Saros 152)

September 10, 1942
(Saros 153)

August 9, 1953
(Saros 154)

July 9, 1964
(Saros 155)

Inex series

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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

December 30, 1815
(Saros 148)

December 9, 1844
(Saros 149)

November 20, 1873
(Saros 150)

October 31, 1902
(Saros 151)

October 11, 1931
(Saros 152)

September 20, 1960
(Saros 153)

August 31, 1989
(Saros 154)

August 11, 2018
(Saros 155)

July 22, 2047
(Saros 156)

July 1, 2076
(Saros 157)

June 12, 2105
(Saros 158)

May 23, 2134
(Saros 159)

April 12, 2192
(Saros 161)

Notes

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  1. ^ "October 11, 1931 Partial Solar Eclipse". timeanddate. Retrieved 3 August 2024.
  2. ^ "Partial Solar Eclipse of 1931 Oct 11". EclipseWise.com. Retrieved 3 August 2024.
  3. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  4. ^ "NASA - Catalog of Solar Eclipses of Saros 152". eclipse.gsfc.nasa.gov.

References

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