The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

Conjunction of the Moon and Mercury

Dominic Ford, Editor
From the Conjunctions feed

Please wait
Loading 0/4
Click and drag to rotate
Mouse wheel to zoom in/out
Touch with mouse to dismiss
The sky at

The Moon and Mercury will share the same right ascension, with the Moon passing 6°56' to the south of Mercury. The Moon will be 28 days old.

From Cambridge, the pair will be visible in the dawn sky, rising at 05:36 (EST) – 1 hour and 30 minutes before the Sun – and reaching an altitude of 10° above the south-eastern horizon before fading from view as dawn breaks around 06:47.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

The Moon will be at mag -9.3, and Mercury at mag 0.2, both in the constellation Sagittarius.

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

A graph of the angular separation between the Moon and Mercury around the time of closest approach is available here.

The positions of the two objects at the moment of conjunction will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 18h34m10s -27°28' Sagittarius -9.3 33'16"3
Mercury 18h34m10s -20°31' Sagittarius 0.2 8"2

The coordinates above are given in J2000.0. The pair will be at an angular separation of 22° from the Sun, which is in Sagittarius at this time of year.

The sky on 20 January 2023
Twilight ends
Twilight begins

28-day old moon
Waning Crescent


28 days old

Rise Culm. Set
Mercury 05:36 10:20 15:03
Venus 08:19 13:23 18:26
Moon 06:23 10:41 15:01
Mars 12:25 20:07 03:49
Jupiter 09:55 16:00 22:04
Saturn 08:24 13:32 18:40
All times shown in EST.


The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

Related news

24 Dec 2022  –  Mercury at highest altitude in evening sky
23 Jan 2023  –  Mercury at highest altitude in morning sky
30 Jan 2023  –  Mercury at greatest elongation west
11 Apr 2023  –  Mercury at highest altitude in evening sky

Image credit

The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.






Color scheme