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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| Gnomon |
A rod or plate mounted vertically to form a shadow-stick, such as that used on a sundial. The altitude of the Sun may be calculated from the height of the rod and the length of the shadow. The direction of the shadow gives the apparent solar time.
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