Conjunction between the Moon and Saturn

2015 Jul 26

Dominic Ford – originally published on

The Moon and Saturn will make a close approach, passing within 2°11' of each other.

From London (click to change), the pair will be difficult to observe as they will appear no higher than 19° above the horizon. They will become visible at around 21:23 (GMT) as the dusk sky fades, 19° above your southern horizon. They will then sink towards the horizon, setting 4 hours and 7 minutes after the Sun at 01:02.

At the moment of closest approach, the Moon will be at mag -12.2, and Saturn at mag 0.9, both in the constellation Libra.

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 Saturn at the moment of closest approach will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 15h46m40s -15°37' Libra -12.2 30'33"9
Saturn 15h45m10s -17°46' Libra 0.9 17"4

The coordinates above are given in J2000.0. The pair will be at an angular separation of 115° from the Sun, which is in Cancer at this time of year.

The details of this observing event were provided courtesy of