Conjunction between the Moon and Saturn

2018 Apr 7

Dominic Ford – originally published on

The Moon and Saturn will make a close approach, passing within 1°55' of each other.

From London (click to change), the pair will be difficult to observe as they will appear no higher than 15° above the horizon. They will be visible in the dawn sky. They will rise at 02:36 (BST), 3 hours and 47 minutes before the Sun, and attain an altitude of 15° above the southern horizon before fading from view as dawn breaks at around 06:00.

At the moment of closest approach, the Moon will be at mag -11.9, and Saturn at mag 1.0, both in the constellation Sagittarius.

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 18h38m00s -20°20' Sagittarius -11.9 29'34"5
Saturn 18h38m00s -22°15' Sagittarius 1.0 16"8

The coordinates above are given in J2000.0. The pair will be at an angular separation of 98° from the Sun, which is in Pisces at this time of year.

The details of this observing event were provided courtesy of