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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| Quarter Day |
Originally the days of the solstices and equinoxes, dividing the year into four quarters. In the English legal system, the quarter days for collecting rents, and so on are: 24 June, 26 September, 25 December and 25 March.
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