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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 have made Astronomical Phenomena 2020, 2021 and 2022 available as free pdf downloads. all three editions can be downloaded by following this link.

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Last modified: Monday, 09 May 2022 at 10:59:40 BST