Solar eclipse of July 31, 1981

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Solar eclipse of July 31, 1981
SE1981Jul31T.png
Map
Type of eclipse
Nature Total
Gamma 0.5792
Magnitude 1.0258
Maximum eclipse
Duration 2m 2s
Coordinates 53.3N 134.1E
Max. width of band 108 km
Times (UTC)
Greatest eclipse 3:46:37
References
Saros 145 (20 of 77)
Catalog # (SE5000) 9467

A total solar eclipse occurred on July 31, 1981. 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, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across the surface of the Earth, while a partial solar eclipse will be visible over a region thousands of kilometres wide.

Related eclipses[edit]

Solar eclipses of 1979-1982[edit]

Each member 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.

Solar eclipse series sets from 1979 to 1982
Ascending node   Descending node
Saros Map Saros Map
120 SE1979Feb26T.png
February 26, 1979
Total
125 SE1979Aug22A.png
August 22, 1979
Annular
130 SE1980Feb16T.png
February 16, 1980
Total
135 SE1980Aug10A.png
August 10, 1980
Annular
140 SE1981Feb04A.png
February 4, 1981
Annular
145 SE1981Jul31T.png
July 31, 1981
Total
150 SE1982Jan25P.png
January 25, 1982
Partial
155 SE1982Jul20P.png
July 20, 1982
Partial
Partial solar eclipses on June 21, 1982 and December 15, 1982 occur in the next lunar year eclipse set.

Saros 145[edit]

This solar eclipse is a part of Saros cycle 145, repeating every 18 years, 11 days, containing 77 events. The series started with partial solar eclipse on January 4, 1639, and reached a first annular eclipse on June 6, 1891. It was a hybrid event on June 17, 1909, and total eclipses from June 29, 1927 through September 9, 2648. The series ends at member 77 as a partial eclipse on April 17, 3009. The longest eclipse will occur on June 25, 2522, with a maximum duration of totality of 7 minutes, 12 seconds. [1]

Series members 16–26 occur between 1901 and 2100:

16 17 18
SE1909Jun17H.png
June 17, 1909
SE1927Jun29T.png
June 29, 1927
1945Jul09T.png
July 9, 1945
19 20 21
SE1963Jul20T.png
July 20, 1963
SE1981Jul31T.png
July 31, 1981
SE1999Aug11T.png
August 11, 1999
22 23 24
SE2017Aug21T.png
August 21, 2017
SE2035Sep02T.png
September 2, 2035
SE2053Sep12T.png
September 12, 2053
25 26
SE2071Sep23T.png
September 23, 2071
SE2089Oct04T.png
October 4, 2089

Metonic series[edit]

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).

This series has 21 eclipse events between July 31, 1924 and July 31, 2000.

July 31-Aug 1 May 19-20 March 7 December 24-25 October 12
115 117 119 121 123
SE1924Jul31P.png
July 31, 1924
SE1928May19T.png
May 19, 1928
SE1932Mar07A.png
March 7, 1932
SE1935Dec25A.png
December 25, 1935
SE1939Oct12T.png
October 12, 1939
125 127 129 131 133
SE1943Aug01A.png
August 1, 1943
SE1947May20T.png
May 20, 1947
SE1951Mar07A.png
March 7, 1951
SE1954Dec25A.png
December 25, 1954
SE1958Oct12T.png
October 12, 1958
135 137 139 141 143
SE1962Jul31A.png
July 31, 1962
SE1966May20A.png
May 20, 1966
SE1970Mar07T.png
March 7, 1970
SE1973Dec24A.png
December 24, 1973
SE1977Oct12T.png
October 12, 1977
145 147 149 151 153
SE1981Jul31T.png
July 31, 1981
SE1985May19P.png
May 19, 1985
SE1989Mar07P.png
March 7, 1989
SE1992Dec24P.png
December 24, 1992
SE1996Oct12P.png
October 12, 1996
155
SE2000Jul31P.png
July 31, 2000

References[edit]

  1. ^ Espenak, Fred (Project & Website Manager), Statistics for Solar Eclipses of Saros 145, NASA, updated 2009 September 26.

External links[edit]

Photos: