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Tuesday, 17 January 2012

Solar lunar planetary eclipses. Astronomy lecture.

An eclipse is an astronomical event that occurs when an astronomical object is temporarily covered by shadow, or when passing through the shadow of another celestial body, or with another body passing between it and the viewer.

 The term eclipse is most often used to describe: -a solar eclipse when the Moon shadow crosses the Earth's surface
-a lunar eclipse, when the Moon enters Earth's shadow.

It can also refer to: -a planet moving in the shadow of one of its satellites,
-a moon passing through the shadow of a planet,
-a moon passing through the shadow of another satellite (moon),
-a binary star system can cause an eclipse, when the two stars intersects, intersection seen from the observer position.

A solar eclipse occurs when the Moon passes in front of the Sun, as seen from Earth. The type of solar eclipse event depends on the distance between the Moon and Earth during the event. A total solar eclipse occurs when Earth crosses the moon shadow. If the shadow does not reach Earth, the Sun is partially occulted, resulting in an annular eclipse. Partial solar eclipses occur when the viewer is inside the penumbra.

lunar eclipse occurs when the Moon passes through Earth's shadow. Since this only happens when the Moon is on the far side of Earth from the Sun, eclipses occur only when it is full moon. Unlike a solar eclipse, an eclipse of the Moon can be seen by almost an entire hemisphere. A Moon eclipse also lasts longer, taking several hours to complete.

My Sun Eclipse Photos

My Moon Eclipse Photos

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