Saturday, August 8, 2009

Why Do Eclipses Occur?


An Eclipse occurs when though their movements of rotation and revolution, the Earth and the moon are in perfect line with the sun.

When the moon is in between the Earth and the sun, preventing direct rays of sun from reaching the Earth, it cause a total or partial solar eclipse.

Lunar eclipse happens when the sun, the moon and the earth are in a straight line and the Earth’s shadow obscures the moon. A lunar eclipse can also be total or partial.

The total dark region of an eclipse is known as ‘Umbra’ and partially dark region is known as ‘Penumbra’. Eclipse have been of man’s interest since the earliest times.


Below Eclipse info from Wikipedia (

The term eclipse is most often used to describe either a solar eclipse, when the Moon's shadow crosses the Earth's surface, or a lunar eclipse, when the Moon moves into the shadow of Earth. However, it can also refer to such events beyond the Earth-Moon system: for example, a planet moving into the shadow cast by one of its moons, a moon passing into the shadow cast by its host planet, or a moon passing into the shadow of another moon. A binary star system can also produce eclipses if the plane of their orbit intersects the position of the observer.

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