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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| Eclipse Year |
The time between successive passages of the Sun through the same node of the Moon’s orbit, which is equal to 346.620 03 days. This period is less than a sidereal year because the changing orientation of the Moon’s orbit causes the node to change position in the sky.
See also: saros.
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