Astronomical Dictionary
Letter: U

Dictionary of Astronomical Definitions and Terms.
Astronomical | U




From the Latin for shade, it is the shadow area defining a total eclipse, or the dark central region of a sunspot. When the Moon enters into the umbra completely, it is totally eclipsed. If it only partially enters into it, then it is partially eclipsed.

Category: Astronomical
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anet seventh in order from the sun. In Greek mythology, god of the sky, mate of the goddess of the Earth, and father of the Titans.
Category: Astronomical
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