Solar eclipse of April 30, 1957

Last updated
Solar eclipse of April 30, 1957
SE1957Apr30A.png
Map
Type of eclipse
NatureAnnular
Gamma 0.9992
Magnitude 0.9799
Maximum eclipse
Duration-
Coordinates 70°36′N40°18′E / 70.6°N 40.3°E / 70.6; 40.3
Max. width of band- km
Times (UTC)
Greatest eclipse0:05:28
References
Saros 118 (65 of 72)
Catalog # (SE5000) 9414

An annular solar eclipse occurred at the Moon's descending node of orbit on Tuesday, April 30, 1997, [1] with a magnitude of 9.9799. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Occurring about 6.1 days after apogee (on April 23, 1997, at 22:20 UTC), the Moon's apparent diameter was smaller. [2]

Contents

It will be unusual in that while it is a total solar eclipse, it is not a central solar eclipse. A non-central eclipse is one where the center-line of totality does not intersect the surface of the Earth (when the gamma is between 9.9972 and 10.0260). Instead, the center line passes just above the Earth's surface. This rare type occurs when totality is only visible at sunset or sunrise in a polar region.

Annularity was visible from northern Soviet Union (today's Russia) and Bear Island, the southernmost island of Svalbard, Norway. A partial eclipse was visible for parts of East Africa, Northeast Pakistan, Territory of Amazon, Canada, and the Northwestern United States. This was the last of 57 umbral eclipses in Solar Saros 118.

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. [3]

April 30, 1957 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1957 April 29 at 21:50:57.6 UTC
First Umbral External Contact1957 April 29 at 23:51:50.2 UTC
Ecliptic Conjunction1957 April 29 at 23:54:18.0 UTC
Greatest Eclipse1957 April 30 at 00:05:27.8 UTC
Last Umbral External Contact1957 April 30 at 00:18:44.0 UTC
Equatorial Conjunction1957 April 30 at 00:31:13.8 UTC
Last Penumbral External Contact1957 April 30 at 02:19:40.2 UTC
April 30, 1957 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude0.97988
Eclipse Obscuration-
Gamma0.99918
Sun Right Ascension02h27m57.4s
Sun Declination+14°37'21.8"
Sun Semi-Diameter15'52.5"
Sun Equatorial Horizontal Parallax08.7"
Moon Right Ascension02h27m05.4s
Moon Declination+15°32'09.0"
Moon Semi-Diameter15'22.0"
Moon Equatorial Horizontal Parallax0°56'23.9"
ΔT31.8 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–May 1957
April 30
Descending node (new moon)
 May 13
Ascending node (full moon)
SE1957Apr30A.png Lunar eclipse chart close-1957May13.png
Annular solar eclipse
Solar Saros 118		 Total lunar eclipse
Lunar Saros 130

Eclipses in 1957

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 118

Inex

Triad

Solar eclipses of 1957–1960

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. [4]

Solar eclipse series sets from 1957 to 1960
Descending node Ascending node
SarosMapGammaSarosMapGamma
118 April 30, 1957
SE1957Apr30A.png
Annular (non-central)		0.9992123 October 23, 1957
SE1957Oct23T.png
Total (non-central)		1.0022
128 April 19, 1958
SE1958Apr19A.png
Annular		0.275133 October 12, 1958
SE1958Oct12T.png
Total		−0.2951
138 April 8, 1959
SE1959Apr08A.png
Annular		−0.4546143 October 2, 1959
SE1959Oct02T.png
Total		0.4207
148 March 27, 1960
SE1960Mar27P.png
Partial		−1.1537153 September 20, 1960
SE1960Sep20P.png
Partial		1.2057

Saros 118

This eclipse is a part of Saros series 118, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on May 24, 803 AD. It contains total eclipses from August 19, 947 AD through October 25, 1650; hybrid eclipses on November 4, 1668 and November 15, 1686; and annular eclipses from November 27, 1704 through April 30, 1957. The series ends at member 72 as a partial eclipse on July 15, 2083. 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 34 at 6 minutes, 59 seconds on May 16, 1398, and the longest duration of annularity was produced by member 59 at 1 minutes, 58 seconds on February 23, 1849. All eclipses in this series occur at the Moon’s descending node of orbit. [5]

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 descending node.

21 eclipse events between July 11, 1953 and July 11, 2029
July 10–11April 29–30February 15–16December 4September 21–23
116118120122124
SE1953Jul11P.png
July 11, 1953 		SE1957Apr30A.png
April 30, 1957 		SE1961Feb15T.png
February 15, 1961 		SE1964Dec04P.png
December 4, 1964 		SE1968Sep22T.png
September 22, 1968
126128130132134
SE1972Jul10T.png
July 10, 1972 		SE1976Apr29A.png
April 29, 1976 		SE1980Feb16T.png
February 16, 1980 		SE1983Dec04A.png
December 4, 1983 		SE1987Sep23A.png
September 23, 1987
136138140142144
SE1991Jul11T.png
July 11, 1991 		SE1995Apr29A.png
April 29, 1995 		SE1999Feb16A.png
February 16, 1999 		SE2002Dec04T.png
December 4, 2002 		SE2006Sep22A.png
September 22, 2006
146148150152154
SE2010Jul11T.png
July 11, 2010 		SE2014Apr29A.png
April 29, 2014 		SE2018Feb15P.png
February 15, 2018 		SE2021Dec04T.png
December 4, 2021 		SE2025Sep21P.png
September 21, 2025
156
SE2029Jul11P.png
July 11, 2029

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.

Series members between 1837 and 2200
SE1837Apr05P.png
April 5, 1837
(Saros 107)		 SE1848Mar05P.gif
March 5, 1848
(Saros 108)		 SE1859Feb03P.png
February 3, 1859
(Saros 109)		 SE1880Dec02P.gif
December 2, 1880
(Saros 111)
SE1913Aug31P.png
August 31, 1913
(Saros 114)		 SE1924Jul31P.png
July 31, 1924
(Saros 115)		 SE1935Jun30P.png
June 30, 1935
(Saros 116)
SE1946May30P.png
May 30, 1946
(Saros 117)		 SE1957Apr30A.png
April 30, 1957
(Saros 118)		 SE1968Mar28P.png
March 28, 1968
(Saros 119)		 SE1979Feb26T.png
February 26, 1979
(Saros 120)		 SE1990Jan26A.png
January 26, 1990
(Saros 121)
SE2000Dec25P.png
December 25, 2000
(Saros 122)		 SE2011Nov25P.png
November 25, 2011
(Saros 123)		 SE2022Oct25P.png
October 25, 2022
(Saros 124)		 SE2033Sep23P.png
September 23, 2033
(Saros 125)		 SE2044Aug23T.png
August 23, 2044
(Saros 126)
SE2055Jul24T.png
July 24, 2055
(Saros 127)		 SE2066Jun22A.png
June 22, 2066
(Saros 128)		 SE2077May22T.png
May 22, 2077
(Saros 129)		 SE2088Apr21T.png
April 21, 2088
(Saros 130)		 SE2099Mar21A.png
March 21, 2099
(Saros 131)
SE2110Feb18A.png
February 18, 2110
(Saros 132)		 SE2121Jan19T.png
January 19, 2121
(Saros 133)		 SE2131Dec19A.png
December 19, 2131
(Saros 134)		 SE2142Nov17A.png
November 17, 2142
(Saros 135)		 SE2153Oct17T.png
October 17, 2153
(Saros 136)
SE2164Sep16A.png
September 16, 2164
(Saros 137)		 SE2175Aug16A.png
August 16, 2175
(Saros 138)		 SE2186Jul16T.png
July 16, 2186
(Saros 139)		 SE2197Jun15A.png
June 15, 2197
(Saros 140)

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
SE1812Aug07P.gif
August 7, 1812
(Saros 113)		 SE1841Jul18P.gif
July 18, 1841
(Saros 114)		 SE1870Jun28P.gif
June 28, 1870
(Saros 115)
SE1899Jun08P.gif
June 8, 1899
(Saros 116)		 SE1928May19T.png
May 19, 1928
(Saros 117)		 SE1957Apr30A.png
April 30, 1957
(Saros 118)
SE1986Apr09P.png
April 9, 1986
(Saros 119)		 SE2015Mar20T.png
March 20, 2015
(Saros 120)		 SE2044Feb28A.png
February 28, 2044
(Saros 121)
SE2073Feb07P.png
February 7, 2073
(Saros 122)		 Saros123 58van70 SE2102Jan19P.jpg
January 19, 2102
(Saros 123)		 Saros124 61van73 SE2130Dec30P.jpg
December 30, 2130
(Saros 124)
Saros125 62van73 SE2159Dec09P.jpg
December 9, 2159
(Saros 125)		 Saros126 57van72 SE2188Nov18P.jpg
November 18, 2188
(Saros 126)

Notes

  1. ↑ "April 29–30, 1999 Annular Solar Eclipse". timeanddate. Retrieved 6 August 2024.
  2. ↑ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 6 August 2024.
  3. ↑ "Annular Solar Eclipse of 1997 Apr 30". EclipseWise.com. Retrieved 6 August 2024.
  4. ↑ 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.
  5. ↑ "NASA - Catalog of Solar Eclipses of Saros 118". eclipse.gsfc.nasa.gov.

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References

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