Galactic core · next 30 nights

Milky Way windows at Butte

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 Oct0.0 h of core visibility in darkness

Highest core altitude7°near 20:40

Usable nights0 / 30Moonlight and cloud still decide image contrast.

Computed local geometry

Core hours after astronomical twilight

10 Octnone1% moon

11 Octnone3% moon

12 Octnone8% moon

13 Octnone13% moon

14 Octnone21% moon

15 Octnone29% moon

16 Octnone37% 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

No dark core window

At this location and season, the core does not reach 10° during astronomical darkness in the next 30 nights. Check live cloud and transparency →

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Keep planning

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.