Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Astronomical Phenomena

Picture of Astronomical Phenomena for 2021 This small, useful booklet contains general interest material preprinted from The Astronomical Almanac. It is published jointly by the U.S. Naval Observatory and Her Majesty's Nautical Almanac Office two years in advance of its date. It includes such things as:

  • dates for Solar equinoxes, solstices, phases of the Moon
  • eclipse maps
  • dates for various planetary phenomena
  • visibility and magnitudes of the planets
  • dates for some religious and civil holidays
  • chronological eras and cycles
  • the equation of time and declination of the Sun
  • sunrise/set, moonrise/set times
  • the position of Polaris.

The booklet is available for purchase through the Government Publishing Office .

A downloadable PDF for the 2020 edition and later is available here.


Some links of interest for Astronomical Phenomena: