Simulated image courtesy of Tom Ruen.

Full Moon

Dominic Ford, Editor
From the Moon feed

Objects: The Moon
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The sky at

The Moon will reach full phase. At this time in its monthly cycle of phases, the Moon lies almost directly opposite the Sun in the sky, placing it high above the horizon for much of the night.

The sequence of full moons through the year are often assigned names according to the seasons in which they fall. This month's will be the second to fall in summer 2021 – the Grain Moon.

Over the nights following 23 July, the Moon will rise around an hour later each day, becoming prominent later in the night. Within a few days, it will only be visible in the pre-dawn and early-morning sky. By the time it reaches last quarter, a week after full moon, it will rise at around midnight and set at around noon.

At the exact moment when the Moon reaches full phase, it will lie at a declination of -23°49' in the constellation Capricornus , and so will appear highest in the southern hemisphere. It will be visible from all latitudes north of 56°N. Its distance from the Earth will be 369,000 km.

The exact position of the Moon at the time it reaches full phase will be:

Object Right Ascension Declination Constellation Angular Size
The Moon 20h17m20s -23°49' Capricornus 32'20"

The coordinates above are given in J2000.0.

The sky on 23 July 2021
Twilight ends
Twilight begins

13-day old moon
Waning Gibbous


13 days old

Rise Culm. Set
Mercury 04:48 12:17 19:46
Venus 08:17 15:04 21:51
Moon 20:36 00:07 04:32
Mars 07:48 14:41 21:34
Jupiter 21:37 03:00 08:18
Saturn 20:42 01:42 06:38
All times shown in EDT.


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

23 Jul 2021  –  Full Moon
31 Jul 2021  –  Moon at Last Quarter
02 Aug 2021  –  The Moon at apogee
08 Aug 2021  –  New Moon

Image credit

Simulated image courtesy of Tom Ruen.






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