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Topics
Here is a list of all topics with brief descriptions:

Astronomical object of interest |
Observer location |
Time of observation and astronomical timescales |
Observing frames |
Apparent equatorial positions on sky |
Geometric equatorial positions and velocities |
Transforming between equatorial systems |
Non-equatorial coordinates |
Atmospheric refraction |
Spectroscopic applications |
Solar-system ephemeris providers |
Earth orientation |
Helpers and utilities |