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 |
|---|---|
| Acronical Observation |
An observation shortly after sunset of a star that is just rising or just setting. Such observations of bright stars e.g. Sirius were used in ancient times for keeping track of the seasons.
See also: heliacal rising.
|