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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| First Quarter |
The phase of the Moon when half the visible disc is illuminated and the Moon is waxing towards full. First quarter occurs when the celestial longitude of the Moon is 90° greater than the Sun’s.
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