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BAA Observing calendar

New Moon

Friday, 2019, August 30 - 11:38

The Moon will pass close to the Sun and become lost in the Sun's glare for a few days.

The Moon's orbital motion carries it around the Earth once every four weeks, and as a result its phases cycle from new moon, through first quarter, full moon and last quarter, back to new moon once every 29.5 days.

This motion also means that the Moon travels more than 12° across the sky from one night to the next, causing it to rise and set nearly an hour later each day. Click here for more information about the Moon's phases.

At new moon, the Earth, Moon and Sun all lie in a roughly straight line, with the Moon in the middle, appearing in front of the Sun's glare. In this configuration, we see almost exactly the opposite half of the Moon to that which is illuminated by the Sun, making it doubly unobservable because the side we see is unilluminated.

Over coming days, the Moon will rise and set an hour later each day, becoming visible in the late afternoon and dusk sky as a waxing crescent which sets soon after the Sun. By first quarter, in a week's time, it will be visible until around midnight.

Its day-by-day progress is charted below, with all times are given below in London local time.

Date Sun
sets at
Moon
sets at
Altitude of Moon
at sunset
Direction of Moon
at sunset
30 Aug 2019 19:49 20:18 west
31 Aug 2019 19:47 20:46 west
01 Sep 2019 19:45 21:11 10° west
02 Sep 2019 19:42 21:35 13° west
03 Sep 2019 19:40 21:56 16° south-west
04 Sep 2019 19:38 22:23 17° south-west
05 Sep 2019 19:36 22:54 18° south-west

At the moment of closest approach, it will pass within 3°56'of the Sun, in the constellation Leo. The exact positions of the Sun and Moon will be:

Object Right Ascension Declination Constellation Angular Size
The Moon 10h39m00s +12°46' Leo 33'26"
Sun (centre) 10h33m +09°07' Leo 31'40"

The coordinates above are given in J2000.0.

This entry in the observing calendar was provided by In-The-Sky.org

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