Galactic core · next 30 nights

Milky Way windows at Denver

This tracks the Sagittarius galactic core only when the Sun is at least 18° below the horizon and the core is at least 10° high. It is geometry, not a weather promise.

Best night10 Oct0.7 h of core visibility in darkness

Highest core altitude13°near 20:00

Usable nights7 / 30Moonlight and cloud still decide image contrast.

Computed local geometry

Core hours after astronomical twilight

10 Oct0.7 h1% moon

11 Oct0.3 h3% moon

12 Oct0.3 h8% moon

13 Oct0.3 h13% moon

14 Oct0.3 h21% moon

15 Oct0.3 h29% moon

16 Oct0.3 h37% moon

17 Octnone47% moon

18 Octnone56% moon

19 Octnone66% moon

20 Octnone74% moon

21 Octnone83% moon

22 Octnone90% moon

23 Octnone95% moon

24 Octnone99% moon

25 Octnone100% moon

26 Octnone98% moon

27 Octnone95% moon

28 Octnone88% moon

29 Octnone80% moon

30 Octnone69% moon

31 Octnone58% moon

1 Novnone46% moon

2 Novnone35% moon

3 Novnone24% moon

4 Novnone15% moon

5 Novnone9% moon

6 Novnone4% moon

7 Novnone1% moon

8 Novnone0% moon

20:00–20:40

This is the widest geometric window in the next month. Check the live forecast before travelling, then favor the darkest moonless portion. Check live cloud and transparency →

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Same coordinates, different question

Moon

Moonless nights

Find the longest uninterrupted dark windows.

Core

Milky Way

See when the galactic core clears the horizon after dark.

−18°

Astronomical darkness

Track true darkness, including polar twilight.