Astronomy and Calendars

  1. NASA — Information on astronomical phenomena and space operations.
  2. U.S. Naval Observatory — Provide Universal Coordinated Time service.
  3. National Space Society — Seek human colonization of space.
  4. Timeanddate Holidays and Observances Around the World — Information on all kinds of holidays and anniversaries celebrated by countries all over the world.
  5. Proposed reform calendar — Makes more sense.
Constitution Research
Last revision: 20250625