英语翻译A total eclipse occurs when the Sun is completely obscur

英语翻译
A total eclipse occurs when the Sun is completely obscured by the Moon.The intensely bright disk of the Sun is replaced by the dark silhouette of the Moon,and the much fainter corona is visible.During any one eclipse,totality is visible only from at most a narrow track on the surface of the Earth.
An annular eclipse occurs when the Sun and Moon are exactly in line,but the apparent size of the Moon is smaller than that of the Sun.Hence the Sun appears as a very bright ring,or annulus,surrounding the outline of the Moon.
A hybrid eclipse (also called annular/total eclipse) transitions between a total and annular eclipse.At some points on the surface of the Earth it is visible as a total eclipse,whereas at others it is annular.Hybrid eclipses are comparatively rare.
A partial eclipse occurs when the Sun and Moon are not exactly in line and the Moon only partially obscures the Sun.This phenomenon can usually be seen from a large part of the Earth outside of the track of an annular or total eclipse.However,some eclipses can only be seen as a partial eclipse,because the umbra never intersects the Earth's surface,passing above or below the Earth's polar regions.
The match between the apparent sizes of the Sun and Moon during a total eclipse is considered coincidental.The Sun's distance from the Earth is about 400 times the Moon's distance,and the Sun's diameter is about 400 times the Moon's diameter.Because these ratios are approximately the same,the sizes of the Sun and the Moon as seen from Earth appear to be approximately the same:about 0.5 degree of arc in angular measure.
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