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 19:31 (EDT), 30° above your southern horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 23:40.

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.

Observing the Moon at first quarter

Over coming days, the Moon will set later each day, becoming visible for more of the night. Within a few days, it will not make it very far above the eastern horizon before nightfall. By the time it reaches full phase, it will be visible for much of the night, rising at around dusk and setting at around dawn.

Its daily progress is charted below, with all times are given in Fairfield local time.

Date Sun
sets at
Moon
sets at
Altitude of Moon
at sunset
Direction of Moon
at sunset
04 Sep 201619:2321:1118°south-west
05 Sep 201619:2221:4122°south-west
06 Sep 201619:1822:1426°south-west
07 Sep 201619:1722:4529°south-west
08 Sep 201619:1623:2530°south
09 Sep 201619:1500:1130°south
10 Sep 201619:1000:5829°south
11 Sep 201619:1001:5126°south-east
12 Sep 201619:0902:5323°south-east
13 Sep 201619:0803:5718°south-east
14 Sep 201619:0705:0312°south-east
15 Sep 201619:0205:02east

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 400,000 km. Its celestial coordinates will be as follows:

Object Right Ascension Declination Constellation Angular Size
The Moon 17h05m30s 17°33'S Ophiuchus 29'48"

The coordinates above are given in J2000.0.

The sky on 09 September 2016
Sunrise
06:27
Sunset
19:15
Twilight ends
20:51
Twilight begins
04:51

8-day old moon
Waxing Gibbous

54%

8 days old

Planets
Rise Culm. Set
Mercury 07:08 13:07 19:05
Venus 08:38 14:26 20:13
Moon 14:00 19:07 00:11
Mars 14:21 18:45 23:10
Jupiter 07:33 13:40 19:46
Saturn 13:24 18:12 22:59
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

09 Sep 2016  –  Moon at First Quarter
16 Sep 2016  –  Full Moon
23 Sep 2016  –  Moon at Last Quarter
30 Sep 2016  –  New Moon

Image credit

Simulated image courtesy of Tom Ruen.

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41.14°N
73.26°W
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