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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| Obliquity of the Ecliptic (symbol e) |
The angle between the planes of the Earth's equator and the ecliptic. Its present value is approximately 23° 26'. The effects of precession and nutation cause it to change between extreme values of 21° 55' and 24° 18'.
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