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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| Second Contact |
In a total or annular eclipse of the Sun, the point when the edges of the Moon’s disc and the Sun’s photosphere are in contact at the start of totality or the annular phase. In a lunar eclipse, second contact occurs when the Moon just enters completely the full shadow umbra of the Earth. The term may also be used to describe the similar stage in the progress of a transit or occultation.
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