Simulated image courtesy of Tom Ruen.

Moon at First Quarter

Dominic Ford, Editor
From the Moon feed

Objects: The Moon
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The sky at

The Moon will pass first quarter phase, appearing prominent in the evening sky and setting in the middle of the night.

From Fairfield , it will become visible around 17:13 (EDT), 55° above your southern horizon, as dusk fades to darkness. It will then reach its highest point in the sky at 17:52, 56° above your southern horizon. It will continue to be observable until around 23:35, when it sinks below 7° above your western horizon.

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

At this time in its monthly cycle of phases, it appears almost exactly half illuminated.

The Moon orbits the Earth once every four weeks, causing its phases to cycle through new moon, first quarter, full moon, last quarter, and back to new moon once every 29.5 days.

As it progresses through this cycle, it is visible at different times of day. At first quarter, it appears high in the sky at sunset before sinking towards the horizon and setting in the middle of the night. More information about the Moon's phases is available here.

The exact moment of first quarter

The exact moment of first quarter is defined as the time when the Moon's ecliptic longitude is exactly 90° away from the Sun's ecliptic longitude, as observed from the center of the Earth. However, the Moon does not appear in any way special at this instant in time, and a first quarter moon can be observed at any time in the evening sky.

At the moment it reaches first quarter, the Moon's distance from the Earth will be 372,000 km. Its celestial coordinates will be as follows:

Object Right Ascension Declination Constellation Angular Size
The Moon 02h05m00s 7°26'N Pisces 32'05"

The coordinates above are given in J2000.0.

The sky on 26 October 2021
Sunrise
07:17
Sunset
17:57
Twilight ends
19:29
Twilight begins
05:45

20-day old moon
Waning Gibbous

66%

20 days old

Planets
Rise Culm. Set
Mercury 05:41 11:30 17:19
Venus 11:29 15:49 20:09
Moon 21:00 05:01 13:00
Mars 06:48 12:16 17:44
Jupiter 15:04 20:13 01:21
Saturn 14:17 19:09 00:01
All times shown in EDT.

Source

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

22 Jan 1964  –  Moon at First Quarter
28 Jan 1964  –  Full Moon
05 Feb 1964  –  Moon at Last Quarter
13 Feb 1964  –  New Moon

Image credit

Simulated image courtesy of Tom Ruen.

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Fairfield

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41.14°N
73.26°W
EDT

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