Nature Annular Magnitude 0.9449 Max. width of band 220 km (140 mi) Start date April 18, 1977 | Gamma -0.399 Duration 424 sec (7 m 4 s) Greatest eclipse 10:31:30 | |
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An annular solar eclipse occurred 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.
Solar eclipses of 1975-1978
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.
References
Solar eclipse of April 18, 1977 Wikipedia(Text) CC BY-SA