Solar eclipse of April 18, 1977
Introduction An annular solar eclipse took place at the Moon's descending node of the orbit on Monday, 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.
Related eclipses === Eclipses in 1977 ===* A partial lunar eclipse on Monday, 4 April 1977. * An annular solar eclipse on Monday, 18 April 1977. * A penumbral lunar eclipse on Tuesday, 27 September 1977. * A total solar eclipse on Wednesday, 12 October 1977.===Solar eclipses of 1975–1978====== 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.Series members 25–35 occur between 1901 and 2100:252627150pxMarch 6, 1905150pxMarch 17, 1923150pxMarch 27, 1941282930150pxApril 8, 1959150pxApril 18, 1977150pxApril 29, 1995313233150pxMay 10, 2013150pxMay 21, 2031150pxMay 31, 20493435150pxJune 11, 2067150pxJune 22, 2085===Inex series=== Inex series members between 1901 and 2100:150pxMay 29, 1919(Saros 136)150pxMay 9, 1948(Saros 137)150pxApril 18, 1977(Saros 138)150pxMarch 29, 2006(Saros 139)150pxMarch 9, 2035(Saros 140)150pxFebruary 17, 2064(Saros 141)150pxJanuary 27, 2093(Saros 142)=== Metonic series===
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