Eclipse - Research Article from World of Earth Science

Cate Tiernan
This encyclopedia article consists of approximately 4 pages of information about Eclipse.
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Eclipse

An eclipse is a phenomenon in which the light from a celestial body is temporarily obscured by the presence of another.

A solar eclipse occurs when the Moon is aligned between the Sun and Earth. The trace of the lunar shadow (where the solar eclipse is visible) is less than 270 km (168 mi) wide. A partial eclipse is visible over a much wider region. When the Moon is further away from Earth, the lunar disc has a smaller visible diameter than the solar disc, so a narrow ring of the Sun remains uncovered, even when the three bodies are aligned. This produces an annular solar eclipse. The ratio between the visible lunar and solar diameters is called the magnitude of the eclipse. At the beginning of the solar eclipse, the Moon progressively covers the solar disk. Illumination of Earth's surface rapidly diminishes. The air temperature falls a few degrees...

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This section contains 1,031 words
(approx. 4 pages at 300 words per page)
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World of Earth Science
Eclipse from World of Earth Science. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.
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