Monday 2026-11-09

Glacier National Park

St. Mary, MT

71 Good night. No moon all night, clear skies.

Astronomical darkness 6:51pm–5:47am (10.92h)

Milky Way core below the horizon all night. It is a summer object here, roughly late April to early September.

Why

Cloud	89	10% cloud, essentially clear
Moon	100	new moon, below the horizon all night, so no moonlight at all
Darkness	100	10h55m of astronomical darkness, 6:51pm–5:47am
Transparency	5	Dewpoint spread 2.5°C, some haze possible
Targets	0	Leonids running, about 0 an hour at best