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BAA Observing calendar

Conjunction between the Moon and Mars

Wednesday, 2017, March 1 - 21:22

Dominic Ford – originally published on

The Moon and Mars will make a close approach, passing within 4°07' of each other.

From London (click to change), the pair will become visible at around 18:02 (BST) as the dusk sky fades, 32° above your south-western horizon. They will then sink towards the horizon, setting 4 hours and 2 minutes after the Sun at 21:41.

At the moment of closest approach, the Moon will be at mag -10.6, and Mars at mag 1.0, both in the constellation Pisces.

The pair will be too widely separated to fit within the field of view of a telescope, but will be visible to the naked eye or through a pair of binoculars.

The precise positions of the Moon and Mars at the moment of closest approach will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 01h33m20s +05°22' Pisces -10.6 32'17"6
Mars 01h28m20s +09°17' Pisces 1.0 4"5

The coordinates above are given in J2000.0. The pair will be at an angular separation of 42° from the Sun, which is in Aquarius at this time of year.

The details of this observing event were provided courtesy of