Home › Tools › Moonless nights

Moonless nights at Flagstaff

The next 30 nights of sky geometry — when astronomical darkness runs, and how much of it the moon stays out of. This is for picking a date. It says nothing about weather, which nobody can forecast a month out.

Minimum dark 2h+ 4h+ 6h+

Moon Below horizon Under 25% Under 50% Ignore

11 QUALIFYING NIGHTS · NEXT 12 Aug · BEST 10 Sept

Night Midday → astronomical dark → midday Window Moon

12 Aug 7.3H 1% 13 Aug 7.3H 3% 14 Aug 7.3H 9% 15 Aug 7.3H 15% 16 Aug 7.3H 24% 17 Aug 6.3H 33% 18 Aug 5.7H 42% 19 Aug 5.0H 52% 20 Aug 4.3H 61% 21 Aug 4.0H 70% 22 Aug 3.0H 78% 23 Aug 2.3H 86% 24 Aug 1.3H 92% 25 Aug — 96% 26 Aug — 99% 27 Aug — 100% 28 Aug — 99% 29 Aug — 95% 30 Aug — 90% 31 Aug — 82% 1 Sept 0.7H 72% 2 Sept 1.3H 62% 3 Sept 2.7H 50% 4 Sept 3.7H 38% 5 Sept 4.7H 27% 6 Sept 8.3H 17% 7 Sept 8.3H 9% 8 Sept 8.3H 4% 9 Sept 8.3H 1% 10 Sept 8.7H 0%

Twilight and daylight Astronomical dark Qualifying window Geometry only — no weather beyond the 7-night forecast.

Moonless nights at Flagstaff

Plan somewhere else