HMNAO banner

[Skip to Content]

Astronomical Phenomena


Astronomical Phenomena 2021 cover This annual publication provides a summary of selected astronomical events. It is published several years in advance and contains much of Section A of the corresponding Astronomical Almanac. This publication includes the phases of the Moon, eclipses of the Sun and Moon, principal occultations, planetary phenomena, elongations and magnitudes of the planets, times of sunrise/set and moonrise/set. Also tabulated are the equation of time, the declination of the Sun and the Greenwich hour angles of the pole stars Polaris and σ Octantis.

A joint publication with the United States Naval Observatory.


To buy HMNAO Astronomical Publications including Astronomical Phenomena please select from the links below:

You can purchase your copy from Admiralty Paper Distributors.

Other Outlets:   TBA



HMNAO are making Astronomical Phenomena 2020 and 2021 available as free pdf downloads from January 1st 2021. They can be downloaded by following this link.

© Crown Copyright 2008-2021 / Privacy Policy
Last modified: Thursday, 23 September 2021 at 16:46:33 BST