First Quarter Moon
Thursday, 20 August 1931 · 12:36 local in London
1931-08-20 11:36 UTC · Europe/London
First Quarter Moon occurs at 12:36 local time in London on 20 August. Half of the visible disc is lit, and the terminator cuts across the middle. Long shadows make craters along the dividing line stand out.
Moon altitude
-19°
At the exact phase
Illumination
50%
First Quarter
Local date
20 Aug
1931
Viewing tips
- Look along the terminator for the strongest crater shadows.
- The Moon is highest in the evening during this phase.
- Binoculars are enough to see major craters and maria.
Visibility, honestly
Below the horizon at the exact moment — look near moonrise or moonset.
A phase is a global instant; whether it is above your horizon depends on location. Weather is not included here. Check the tonight outlook for cloud cover and a viewing score. No eclipse or conjunction claim is made on this page.
Phase times from Astronomy Engine. Rise/set and altitude use atmospheric refraction. Method
First Quarter · 50% lit
Phase at 12:36 local · NASA LRO surface
Next moonrise
15:02
Next moonset
22:40
Next events
Calendar →Aug 1931
28
Full Moon
Above horizon04:10 local · Fri, Fri 28 Aug · Moon 14°
Sept 1931
5
Last Quarter Moon
Above horizon08:21 local · Sat, Sat 5 Sept · Moon 59°
Sept 1931
12
New Moon
Not visible05:26 local · Sat, Sat 12 Sept · Moon -10°
Sept 1931
18
First Quarter Moon
Above horizon21:37 local · Fri, Fri 18 Sept · Moon 1°