| 词条 | Solar eclipse of April 18, 1977 | |||||||||||||||||||||||||
| 释义 |
An annular solar eclipse took place 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 eclipsesSolar eclipses of 1975-1978{{Solar eclipse set 1975-1978}}Saros 138It 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.
Metonic series{{Solar Metonic series 2000 February 5}}{{template reference list}}NotesReferences{{Solar eclipse NASA reference|1951/SE1977Apr18A|19770407}}{{Solar eclipses}}{{Solar-eclipse-stub}} 4 : Annular solar eclipses|1977 in science|20th-century solar eclipses|April 1977 events |
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