How to draw sky chart? [closed]
问题 How do I draw a star chart like this? I have: A star database with coordinates (right ascension and declination) Observer coordinates (latitude, longitude) Time of observation I need a formula which considered these parameters. 回答1: stellar database google for: BSC (Bright star catalog) ~10K stars up to +6.5 mag (naked eye) Hipparcos ~118K stars up to +12 mag (telescopes) and also has parallax (3D coordinates) and many more Hipparcos is mine favorite. both can be downloaded freely in ASCII