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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| Last Quarter |
The phase of the Moon when it is waning towards new Moon and appears as an illuminated semicircle. Last quarter is formally defined as the time when the Moon’s celestial longitude is 270° greater than the Sun’s. It occurs about seven days after full Moon.
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