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 18:47 (EDT), 72° above your south-western horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 01:53.

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 401,000 km. Its celestial coordinates will be as follows:

Object Right Ascension Declination Constellation Angular Size
The Moon 07h48m40s 25°24'N Gemini 29'46"

The coordinates above are given in J2000.0.

The sky on 22 June 2021
Sunrise
05:20
Sunset
20:32
Twilight ends
22:40
Twilight begins
03:12

12-day old moon
Waxing Gibbous

95%

12 days old

Planets
Rise Culm. Set
Mercury 04:40 11:51 19:01
Venus 07:07 14:37 22:06
Moon 18:23 23:14 04:04
Mars 08:11 15:28 22:45
Jupiter 23:46 05:08 10:29
Saturn 22:53 03:51 08:49
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

14 Apr 1951  –  Moon at First Quarter
21 Apr 1951  –  Full Moon
28 Apr 1951  –  Moon at Last Quarter
05 May 1951  –  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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