Solar eclipse of July 11, 1991

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Solar eclipse of July 11, 1991
Eclipse CR 1991 a zoom.jpg
Totality from Guanacaste, Costa Rica
SE1991Jul11T.png
Map
Type of eclipse
Nature Total
Gamma -0.0041
Magnitude 1.08
Maximum eclipse
Duration 6m 53s
Coordinates 22N 105.2W
Max. width of band 258 km
Times (UTC)
(P1) Partial begin 16:28:46
(U1) Total begin 17:21:41
Greatest eclipse 19:07:01
(U4) Total end 20:50:28
(P4) Partial end 21:43:24
References
Saros 136 (36 of 71)
Catalog # (SE5000) 9489

A total solar eclipse occurred on July 11, 1991. 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.

Totality beginning over the Pacific Ocean and Hawaii moving across Mexico, down through Central America and across South America ending over Brazil. It lasted for 6 minutes and 53 seconds at the point of maximum eclipse. There will not be a longer total eclipse until June 13, 2132.

This eclipse was the most central total eclipse in 800 years, with a gamma of -.0041. There will not be a more central eclipse for another 800 years. Its magnitude was also greater than any eclipse since the 6th century.

Observations[edit]

Related eclipses[edit]

Solar eclipses 1990-1992[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 1990–1992
Ascending node   Descending node
Saros Map Saros Map
121 January 26, 1990
SE1990Jan26A.png
Annular
126 July 22, 1990
SE1990Jul22T.png
Total
131 January 15, 1991
SE1991Jan15A.png
Annular
136
Eclipse CR 1991 a zoom.jpg
July 11, 1991
SE1991Jul11T.png
Total
141 January 4, 1992
SE1992Jan04A.png
Annular
146 June 30, 1992
SE1992Jun30T.png
Total
151 December 24, 1992
SE1992Dec24P.png
Partial

Saros 136[edit]

Solar Saros 136, repeating every 18 years, 11 days, contains 71 events. The series started with partial solar eclipse on Jun 14, 1360, and reached a first annular eclipse on September 8, 1504. It was a hybrid event from November 22, 1612, through January 17, 1703, and total eclipses from January 27, 1721 through May 13, 2496. The series ends at member 71 as a partial eclipse on July 30, 2622, with the entire series lasting 1262 years. The longest eclipse occurred on June 20, 1955, with a maximum duration of totality at 7 minutes, 8 seconds.[1]

Series members 29–42 occur between 1865 and 2100:

28 29 30
SE1865Apr25T.gif
April 25, 1865
SE1883May06T.png
May 6, 1883
31 32 33
SE1901May18T.png
May 18, 1901
SE1919May29T.png
May 29, 1919
SE1937Jun08T.png
Jun 8, 1937
34 35 36
SE1955Jun20T.png
Jun 20, 1955
SE1973Jun30T.png
Jun 30, 1973
SE1991Jul11T.png
Jul 11, 1991
37 38 39
SE2009Jul22T.png
Jul 22, 2009
SE2027Aug02T.png
Aug 2, 2027
SE2045Aug12T.png
Aug 12, 2045
40 41 42
SE2063Aug24T.png
Aug. 24, 2063
SE2081Sep03T.png
Sep. 3, 2081
SE2099Sep14T.png
Sep. 14, 2099

Inex series[edit]

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.

Inex series members between 1901 and 2100:

SE1904Sep09T.png
September 9, 1904
(Saros 133)
SE1933Aug21A.png
August 21, 1933
(Saros 134)
SE1962Jul31A.png
July 31, 1962
(Saros 135)
SE1991Jul11T.png
July 11, 1991
(Saros 136)
SE2020Jun21A.png
June 21, 2020
(Saros 137)
SE2049May31A.png
May 31, 2049
(Saros 138)
SE2078May11T.png
May 11, 2078
(Saros 139)

Tritos series[edit]

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 1901 and 2100 are:

SE1904Mar17A.png
March 17, 1904
(Saros 128)
SE1915Feb14A.png
February 14, 1915
(Saros 129)
SE1926Jan14T.png
January 14, 1926
(Saros 130)
SE1936Dec13A.png
December 13, 1936
(Saros 131)
SE1947Nov12A.png
November 12, 1947
(Saros 132)
SE1958Oct12T.png
October 12, 1958
(Saros 133)
SE1969Sep11A.png
September 11, 1969
(Saros 134)
SE1980Aug10A.png
August 10, 1980
(Saros 135)
SE1991Jul11T.png
July 11, 1991
(Saros 136)
SE2002Jun10A.png
June 10, 2002
(Saros 137)
SE2013May10A.png
May 10, 2013
(Saros 138)
SE2024Apr08T.png
April 8, 2024
(Saros 139)
SE2035Mar09A.png
March 9, 2035
(Saros 140)
SE2046Feb05A.png
February 5, 2046
(Saros 141)
SE2057Jan05T.png
January 5, 2057
(Saros 142)
SE2067Dec06H.png
December 6, 2067
(Saros 143)
SE2078Nov04A.png
November 4, 2078
(Saros 144)
SE2089Oct04T.png
October 4, 2089
(Saros 145)
SE2100Sep04T.png
September 4, 2100
(Saros 146)

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 11, 1953 and July 11, 2029.

Notes[edit]

References[edit]

Photos: