Tag: astronomy

24 How long till Halley's Comet returns? 2021-01-03T21:56:12.940

19 How far is the Sun? 2016-01-25T09:28:51.680

14 Parse a variable star designation 2020-05-14T19:18:09.443

10 Calculate the Lunar Phase 2016-01-19T12:37:10.013