Solar eclipse of July 31, 1981

Last updated
Solar eclipse of July 31, 1981
SE1981Jul31T.png
Map
Type of eclipse
NatureTotal
Gamma 0.5792
Magnitude 1.0258
Maximum eclipse
Duration122 sec (2 m 2 s)
Coordinates 53°18′N134°06′E / 53.3°N 134.1°E / 53.3; 134.1
Max. width of band108 km (67 mi)
Times (UTC)
Greatest eclipse3:46:37
References
Saros 145 (20 of 77)
Catalog # (SE5000) 9467

A total solar eclipse occurred at the Moon's ascending node of the orbit 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'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. The continental path of totality fell entirely within the Soviet Union, belonging to Georgia, Kazakhstan and Russia today. The southern part of Mount Elbrus, the highest mountain in Europe, also lies in the path of totality. Occurring only 3.8 days after perigee (Perigee on July 27, 1981), the Moon's apparent diameter was larger. With a path width of 107.8 km (66.984 mi, or 353,674.541 feet), this total solar eclipse had an average path.

Contents

It was the 20th eclipse of the 145th Saros cycle, which began with a partial eclipse on January 4, 1639 and will conclude with a partial eclipse on April 17, 3009.

The moon's apparent diameter was 7 arcseconds larger than the February 4, 1981 annular solar eclipse. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

Eclipses in 1981

Solar eclipses of 1979–1982

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. [15] There were 8 solar eclipses between February 26, 1979 and July 20, 1982. Were there: February 26, 1979 (total solar eclipse, 0.8 days after perigee, 103.9%, 0.89811 gamma, saros 120), August 22, 1979 (small annular solar eclipse, 0.6 days before apogee, 93.3%, −0.96319 gamma, saros 125), February 16, 1980 (total solar eclipse, 1 day before perigee, 104.3%, 0.22244 gamma, saros 130), August 10, 1980 (large annular solar eclipse, 5 days before apogee, 97.3%, −0.19154 gamma, saros 135), February 4, 1981 (large annular solar eclipse, 4 days before perigee, 99.4%, −0.48375 gamma, saros 140), July 31, 1981 (total solar eclipse, 3.8 days after perigee, 102.6%, 0.57917 gamma, saros 145), January 25, 1982 (moderate partial solar eclipse, 4.7 days after apogee, 56.6%, −1.23110 gamma, saros 150) and July 20, 1982 (small partial solar eclipse, 0.9 days after perigee, 46.4%, 1.28859 gamma, saros 155).

Solar eclipse series sets from 1979–1982
Descending node Ascending node
Saros Map Gamma Saros Map Gamma
120 SE1979Feb26T.png
1979 February 26
Total		0.89811125 SE1979Aug22A.png
1979 August 22
Annular		−0.96319
130 SE1980Feb16T.png
1980 February 16
Total		0.22244135 SE1980Aug10A.png
1980 August 10
Annular		−0.19154
140 SE1981Feb04A.png
1981 February 4
Annular		−0.48375145 SE1981Jul31T.png
1981 July 31
Total		0.57917
150 SE1982Jan25P.png
1982 January 25
Partial		−1.23110155 SE1982Jul20P.png
1982 July 20
Partial		1.28859
Partial solar eclipses on June 21, 1982 and December 15, 1982 occur in the next lunar year eclipse set.

Saros 145

This solar eclipse is a part of Saros cycle 145, repeating every 18 years, 11 days, 8 hours, containing 77 events. The series started with a 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. All eclipses in this series occurs at the Moon's ascending node.

Series members 10–32 occur between 1801 and 2359
101112
SE1801Apr13P.png
April 13, 1801		 SE1819Apr24P.png
April 24, 1819		 SE1837May04P.png
May 4, 1837
131415
SE1855May16P.png
May 16, 1855		 SE1873May26P.png
May 26, 1873		 SE1891Jun06A.png
June 6, 1891
161718
SE1909Jun17H.png
June 17, 1909 		SE1927Jun29T.png
June 29, 1927 		1945Jul09T.png
July 9, 1945
192021
SE1963Jul20T.png
July 20, 1963 		SE1981Jul31T.png
July 31, 1981 		SE1999Aug11T.png
August 11, 1999
222324
SE2017Aug21T.png
August 21, 2017 		SE2035Sep02T.png
September 2, 2035 		SE2053Sep12T.png
September 12, 2053
252627
SE2071Sep23T.png
September 23, 2071 		SE2089Oct04T.png
October 4, 2089 		SE2107Oct16T.png
October 16, 2107
282930
SE2125Oct26T.png
October 26, 2125		 SE2143Nov07T.png
November 7, 2143		 SE2161Nov17T.png
November 17, 2161
313233
SE2179Nov28T.png
November 28, 2179		 SE2197Dec09T.png
December 9, 2197		 SE2215Dec21T.png
December 21, 2215
343536
SE2233Dec31T.png
December 31, 2233		 SE2252Jan12T.png
January 12, 2252		 SE2270Jan22T.png
January 22, 2270
373839
SE2288Feb02T.png
February 2, 2288		 SE2306Feb14T.png
February 14, 2306		 SE2324Feb25T.png
February 25, 2324
40
SE2342Mar08T.png
March 8, 2342

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.

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.

22 eclipse events between December 24, 1916 and July 31, 2000
December 24–25October 12–13July 31-Aug 1May 18–20March 7–8
9193959799
December 23, 1878October 12, 1882July 31, 1886May 18, 1890March 7, 1894
101103105107109
December 23, 1897October 12, 1901August 1, 1905May 19, 1909March 8, 1913
111113115117119
SE1916Dec24P.png
December 24, 1916 		October 12, 1920 SE1924Jul31P.png
July 31, 1924 		SE1928May19T.png
May 19, 1928 		SE1932Mar07A.png
March 7, 1932
121123125127129
SE1935Dec25A.png
December 25, 1935 		SE1939Oct12T.png
October 12, 1939 		SE1943Aug01A.png
August 1, 1943 		SE1947May20T.png
May 20, 1947 		SE1951Mar07A.png
March 7, 1951
131133135137139
SE1954Dec25A.png
December 25, 1954 		SE1958Oct12T.png
October 12, 1958 		SE1962Jul31A.png
July 31, 1962 		SE1966May20A.png
May 20, 1966 		SE1970Mar07T.png
March 7, 1970
141143145147149
SE1973Dec24A.png
December 24, 1973 		SE1977Oct12T.png
October 12, 1977 		SE1981Jul31T.png
July 31, 1981 		SE1985May19P.png
May 19, 1985 		SE1989Mar07P.png
March 7, 1989
151153155157159
SE1992Dec24P.png
December 24, 1992 		SE1996Oct12P.png
October 12, 1996 		SE2000Jul31P.png
July 31, 2000 		May 19, 2004March 7, 2008
161163165167169
December 24, 2011October 13, 2015August 1, 2019May 19, 2023March 8, 2027

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References

  1. ↑ "Muscovites view eclipse of the sun". Spokane Chronicle. Spokane, Washington. 1981-07-31. p. 3. Retrieved 2023-10-18– via Newspapers.com.
  2. ↑ "Bad weather hampers view of solar eclipse". Abilene Reporter-News. Abilene, Texas. 1981-07-31. p. 16. Retrieved 2023-10-18– via Newspapers.com.
  3. ↑ "Scientists Get Good Solar Eclipse Look". The Daily Advertiser. Lafayette, Louisiana. 1981-07-31. p. 6. Retrieved 2023-10-18– via Newspapers.com.
  4. ↑ "Former Beatrician among group studying eclipse in Russia". Beatrice Daily Sun. Beatrice, Nebraska. 1981-07-31. p. 3. Retrieved 2023-10-18– via Newspapers.com.
  5. ↑ "Clouds obstruct most of Soviet eclipse". Springfield Leader and Press. Springfield, Missouri. 1981-07-31. p. 17. Retrieved 2023-10-18– via Newspapers.com.
  6. ↑ "High-flying scientists view moon's path across sun". The Kokomo Tribune. Kokomo, Indiana. 1981-07-31. p. 13. Retrieved 2023-10-18– via Newspapers.com.
  7. ↑ "Long eclipse". Liverpool Echo. Liverpool, Merseyside, England. 1981-07-31. p. 1. Retrieved 2023-10-18– via Newspapers.com.
  8. ↑ "Black day for Reds". Manchester Evening News. Manchester, Greater Manchester, England. 1981-07-31. p. 1. Retrieved 2023-10-18– via Newspapers.com.
  9. ↑ "Clouds spoil view of eclipse of sun". Calgary Herald. Calgary, Alberta, Canada. 1981-07-31. p. 14. Retrieved 2023-10-18– via Newspapers.com.
  10. ↑ "Total eclipse". North Bay Nugget. North Bay, Ontario, Canada. 1981-07-31. p. 2. Retrieved 2023-10-18– via Newspapers.com.
  11. ↑ "Weather blocks eclipse view". Edmonton Journal. Edmonton, Alberta, Canada. 1981-07-31. p. 48. Retrieved 2023-10-18– via Newspapers.com.
  12. ↑ "Hundreds of scientists study eclipse of sun". Standard-Speaker. Hazleton, Pennsylvania. 1981-08-01. p. 5. Retrieved 2023-10-18– via Newspapers.com.
  13. ↑ "Americans Join Scientists to Observe Eclipse". Tulsa World. Tulsa, Oklahoma. 1981-08-01. p. 32. Retrieved 2023-10-18– via Newspapers.com.
  14. ↑ "Eclipse casts its giant shadow across 4,300-mile Soviet path". Arizona Daily Star. Tucson, Arizona. 1981-08-01. p. 2. Retrieved 2023-10-18– via Newspapers.com.
  15. ↑ 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.

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