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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| Third Quarter |
The phase of the Moon when half the visible disc of the waning Moon is illuminated. Third quarter occurs when the celestial longitude of the Moon is 270° greater than the Sun’s.
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