Solar eclipse of April 18, 1931

Last updated
Solar eclipse of April 18, 1931
SE1931Apr18P.png
Map
Type of eclipse
NaturePartial
Gamma 1.2643
Magnitude 0.5107
Maximum eclipse
Coordinates 61°30′N58°54′E / 61.5°N 58.9°E / 61.5; 58.9
Times (UTC)
Greatest eclipse0:45:35
References
Saros 147 (18 of 80)
Catalog # (SE5000) 9353

A partial solar eclipse occurred at the Moon's ascending node of orbit between Friday, April 17 and Saturday, April 18, 1931, [1] with a magnitude of 0.5107. 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.

Contents

A partial eclipse was visible for parts of East Asia and North Asia.

Eclipse details

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]

April 18, 1931 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1931 April 17 at 22:57:48.0 UTC
Greatest Eclipse1931 April 18 at 00:45:34.6 UTC
Ecliptic Conjunction1931 April 18 at 00:59:58.6 UTC
Equatorial Conjunction1931 April 18 at 01:59:51.2 UTC
Last Penumbral External Contact1931 April 18 at 02:32:47.7 UTC
April 18, 1931 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude0.51068
Eclipse Obscuration0.39455
Gamma1.26430
Sun Right Ascension01h40m20.1s
Sun Declination+10°25'14.0"
Sun Semi-Diameter15'55.6"
Sun Equatorial Horizontal Parallax08.8"
Moon Right Ascension01h38m13.6s
Moon Declination+11°26'51.3"
Moon Semi-Diameter14'54.6"
Moon Equatorial Horizontal Parallax0°54'43.2"
ΔT24.0 s

Eclipse season

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.

Eclipse season of April 1931
April 2
Descending node (full moon)
April 18
Ascending node (new moon)
Lunar eclipse chart close-1931Apr02.png SE1931Apr18P.png
Total lunar eclipse
Lunar Saros 121
Partial solar eclipse
Solar Saros 147

Eclipses in 1931

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 147

Inex

Triad

Solar eclipses of 1928–1931

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
SarosMapGammaSarosMapGamma
117 May 19, 1928
SE1928May19T.png
Total (non-central)
1.0048122 November 12, 1928
SE1928Nov12P.png
Partial
1.0861
127 May 9, 1929
SE1929May09T.png
Total
−0.2887132 November 1, 1929
SE1929Nov01A.png
Annular
0.3514
137 April 28, 1930
SE1930Apr28H.png
Hybrid
0.473142 October 21, 1930
SE1930Oct21T.png
Total
−0.3804
147 April 18, 1931
SE1931Apr18P.png
Partial
1.2643152 October 11, 1931
SE1931Oct11P.png
Partial
−1.0607

Saros 147

This eclipse is a part of Saros series 147, repeating every 18 years, 11 days, and containing 80 events. The series started with a partial solar eclipse on October 12, 1624. It contains annular eclipses from May 31, 2003 through July 31, 2706. There are no hybrid or total eclipses in this set. The series ends at member 80 as a partial eclipse on February 24, 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 annularity will be produced by member 38 at 9 minutes, 41 seconds on November 21, 2291. All eclipses in this series occur at the Moon’s ascending node of orbit. [4]

Series members 11–32 occur between 1801 and 2200:
111213
SE1805Jan30P.gif
January 30, 1805
SE1823Feb11P.gif
February 11, 1823
SE1841Feb21P.gif
February 21, 1841
141516
SE1859Mar04P.gif
March 4, 1859
SE1877Mar15P.gif
March 15, 1877
SE1895Mar26P.gif
March 26, 1895
171819
SE1913Apr06P.png
April 6, 1913
SE1931Apr18P.png
April 18, 1931
SE1949Apr28P.png
April 28, 1949
202122
SE1967May09P.png
May 9, 1967
SE1985May19P.png
May 19, 1985
SE2003May31A.png
May 31, 2003
232425
SE2021Jun10A.png
June 10, 2021
SE2039Jun21A.png
June 21, 2039
SE2057Jul01A.png
July 1, 2057
262728
SE2075Jul13A.png
July 13, 2075
SE2093Jul23A.png
July 23, 2093
SE2111Aug04A.png
August 4, 2111
293031
SE2129Aug15A.png
August 15, 2129
Saros147 30van80 SE2147Aug26A.jpg
August 26, 2147
Saros147 31van80 SE2165Sep05A.jpg
September 5, 2165
32
Saros147 32van80 SE2183Sep16A.jpg
September 16, 2183

Metonic series

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.

23 eclipse events between February 3, 1859 and June 29, 1946
February 1–3November 21–22September 8–10June 28–29April 16–18
109111113115117
SE1859Feb03P.png
February 3, 1859
SE1862Nov21P.gif
November 21, 1862
SE1870Jun28P.gif
June 28, 1870
SE1874Apr16T.gif
April 16, 1874
119121123125127
SE1878Feb02A.gif
February 2, 1878
SE1881Nov21A.gif
November 21, 1881
SE1885Sep08T.png
September 8, 1885
SE1889Jun28A.png
June 28, 1889
SE1893Apr16T.png
April 16, 1893
129131133135137
SE1897Feb01A.gif
February 1, 1897
SE1900Nov22A.gif
November 22, 1900
SE1904Sep09T.png
September 9, 1904
SE1908Jun28A.png
June 28, 1908
SE1912Apr17H.png
April 17, 1912
139141143145147
SE1916Feb03T.png
February 3, 1916
SE1919Nov22A.png
November 22, 1919
SE1923Sep10T.png
September 10, 1923
SE1927Jun29T.png
June 29, 1927
SE1931Apr18P.png
April 18, 1931
149151153155
SE1935Feb03P.png
February 3, 1935
SE1938Nov21P.png
November 21, 1938
SE1942Sep10P.png
September 10, 1942
SE1946Jun29P.png
June 29, 1946

Tritos series

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 eclipse on November 4, 2116 (part of Saros 164) is also a part of this series but is not included in the table below.

Series members between 1801 and 2029
SE1811Mar24T.gif
March 24, 1811
(Saros 136)
SE1822Feb21A.gif
February 21, 1822
(Saros 137)
SE1833Jan20A.gif
January 20, 1833
(Saros 138)
SE1843Dec21T.gif
December 21, 1843
(Saros 139)
SE1854Nov20H.png
November 20, 1854
(Saros 140)
SE1865Oct19A.png
October 19, 1865
(Saros 141)
SE1876Sep17T.gif
September 17, 1876
(Saros 142)
SE1887Aug19T.png
August 19, 1887
(Saros 143)
SE1898Jul18A.gif
July 18, 1898
(Saros 144)
SE1909Jun17H.png
June 17, 1909
(Saros 145)
SE1920May18P.png
May 18, 1920
(Saros 146)
SE1931Apr18P.png
April 18, 1931
(Saros 147)
SE1942Mar16P.png
March 16, 1942
(Saros 148)
SE1953Feb14P.png
February 14, 1953
(Saros 149)
SE1964Jan14P.png
January 14, 1964
(Saros 150)
SE1974Dec13P.png
December 13, 1974
(Saros 151)
SE1985Nov12T.png
November 12, 1985
(Saros 152)
SE1996Oct12P.png
October 12, 1996
(Saros 153)
SE2007Sep11P.png
September 11, 2007
(Saros 154)
SE2018Aug11P.png
August 11, 2018
(Saros 155)
SE2029Jul11P.png
July 11, 2029
(Saros 156)

Inex series

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
SE1815Jul06T.png
July 6, 1815
(Saros 143)
SE1844Jun16P.png
June 16, 1844
(Saros 144)
SE1873May26P.png
May 26, 1873
(Saros 145)
SE1902May07P.png
May 7, 1902
(Saros 146)
SE1931Apr18P.png
April 18, 1931
(Saros 147)
SE1960Mar27P.png
March 27, 1960
(Saros 148)
SE1989Mar07P.png
March 7, 1989
(Saros 149)
SE2018Feb15P.png
February 15, 2018
(Saros 150)
SE2047Jan26P.png
January 26, 2047
(Saros 151)
SE2076Jan06T.png
January 6, 2076
(Saros 152)
Saros153 14van70 SE2104Dec17A.jpg
December 17, 2104
(Saros 153)
Saros154 13van71 SE2133Nov26A.jpg
November 26, 2133
(Saros 154)
Saros155 14van71 SE2162Nov07T.jpg
November 7, 2162
(Saros 155)
Saros156 11van69 SE2191Oct18A.jpg
October 18, 2191
(Saros 156)

Notes

  1. "April 17–18, 1931 Partial Solar Eclipse". timeanddate. Retrieved 3 August 2024.
  2. "Partial Solar Eclipse of 1931 Apr 18". 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 147". eclipse.gsfc.nasa.gov.

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References