CELESTIAL CALCULATOR & EPHEMERIS·NOAA & MEEUS
Astronomy · Boulder
A live observatory for the Sun, Moon, daylight, twilight and the sky above Boulder.
Daylight, Twilight & Solar Rhythm
TOTAL DAYLIGHT DURATION13h 5m+106s compared to yesterday
NIGHT DURATION10h 55mAstronomical darkness & twilights
MORNING GOLDEN HOUR05:05 - 05:38Soft warm lighting
EVENING GOLDEN HOUR17:37 - 18:10Optimum photography window
Night (≤ -18°)
Astro Twilight (-18° to -12°)
Nautical (-12° to -6°)
Civil (-6° to 0°)
Daylight (> 0°)
DAWN (MORNING)
Astronomical Dawn03:40
Nautical Dawn04:10
Civil Dawn04:40
Sunrise05:05
DUSK (EVENING)
Sunset18:10
Civil Dusk18:35
Nautical Dusk19:04
Astronomical Dusk19:35