Solar eclipse of April 18, 1977

Last updated
Solar eclipse of April 18, 1977
SE1977Apr18A.png
Map
Type of eclipse
NatureAnnular
Gamma -0.399
Magnitude 0.9449
Maximum eclipse
Duration424 sec (7 m 4 s)
Coordinates 11°54′S28°18′E / 11.9°S 28.3°E / -11.9; 28.3
Max. width of band220 km (140 mi)
Times (UTC)
Greatest eclipse10:31:30
References
Saros 138 (29 of 70)
Catalog # (SE5000) 9458

An annular solar eclipse took place on April 18, 1977. 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. Annularity was visible in South West Africa (today's Namibia), Angola, Zambia, southeastern Zaire (today's Democratic Republic of Congo), northern Malawi, Tanzania, Seychelles and the whole British Indian Ocean Territory.

Contents

Eclipses in 1977

Solar eclipses of 1975–1978

There were 8 solar eclipses (at 6 month intervals) between May 11, 1975 and October 2, 1978.

Solar eclipse series sets from 1975–1978
Descending node Ascending node
SarosMapGammaSarosMapGamma
118 SE1975May11P.png
1975 May 11
Partial
1.06472123 SE1975Nov03P.png
1975 November 3
Partial
-1.02475
128 SE1976Apr29A.png
1976 April 29
Annular
0.33783133 SE1976Oct23T.png
1976 October 23
Total
-0.32699
138 SE1977Apr18A.png
1977 April 18
Annular
-0.39903143 SE1977Oct12T.png
1977 October 12
Total
0.38363
148 SE1978Apr07P.png
1978 April 7
Partial
-1.10812153 SE1978Oct02P.png
1978 October 2
Partial
1.16164

Saros 138

It is a part of Saros cycle 138, repeating every 18 years, 11 days, containing 70 events. The series started with partial solar eclipse on June 6, 1472. It contains annular eclipses from August 31, 1598, through February 18, 2482 with a hybrid eclipse on March 1, 2500. It has total eclipses from March 12, 2518, through April 3, 2554. The series ends at member 70 as a partial eclipse on July 11, 2716. The longest duration of totality will be only 56 seconds on April 3, 2554.

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.

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.

22 eclipse events between September 12, 1931 and July 1, 2011.
September 11-12June 30-July 1April 17-19February 4-5November 22-23
114116118120122
SE1931Sep12P.png
September 12, 1931
SE1935Jun30P.png
June 30, 1935
SE1939Apr19A.png
April 19, 1939
SE1943Feb04T.png
February 4, 1943
SE1946Nov23P.png
November 23, 1946
124126128130132
SE1950Sep12T.png
September 12, 1950
SE1954Jun30T.png
June 30, 1954
SE1958Apr19A.png
April 19, 1958
SE1962Feb05T.png
February 5, 1962
SE1965Nov23A.png
November 23, 1965
134136138140142
SE1969Sep11A.png
September 11, 1969
SE1973Jun30T.png
June 30, 1973
SE1977Apr18A.png
April 18, 1977
SE1981Feb04A.png
February 4, 1981
SE1984Nov22T.png
November 22, 1984
144146148150152
SE1988Sep11A.png
September 11, 1988
SE1992Jun30T.png
June 30, 1992
SE1996Apr17P.png
April 17, 1996
SE2000Feb05P.png
February 5, 2000
SE2003Nov23T.png
November 23, 2003
154156
SE2007Sep11P.png
September 11, 2007
SE2011Jul01P.png
July 1, 2011

Notes

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    References