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 |
|---|---|
| Heliacal Rising |
The rising of a bright star just before the Sun. In practice, the date of heliacal rising would be when the star was first observable in the eastern dawn sky. The heliacal rising of Sirius was used by the ancient Egyptians as a herald of the flooding of the River Nile.
|