Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Nautical Twilight |
Formally defined as the interval of time during which the Sun is between 96° and 102° below the zenith point.
See also: twilight.
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