Calculate sunrise, sunset, solar noon, day length, and civil, nautical, and astronomical twilight times for any location and date.
Solar calculations based on NOAA algorithms. Times shown are in solar time for the given longitude.
Day summary
of daylight between sunrise and sunset on 2026-03-21.
Civil twilight (sun 6° below horizon)
Nautical twilight (sun 12° below horizon)
Astronomical twilight (sun 18° below horizon)
Also in Calendar Reference
Dates & Time
Calculate sunrise, sunset, solar noon, and day length for any location and date, with civil, nautical, and astronomical twilight times.
The calculator uses NOAA solar position algorithms to compute the sun's declination and hour angle for a given latitude, longitude, and date. Sunrise and sunset occur when the sun's centre is 0.833° below the horizon (accounting for refraction and solar disc radius).
Civil twilight (sun 6° below horizon) provides enough light for outdoor activities. Nautical twilight (12°) lets sailors distinguish the horizon. Astronomical twilight (18°) marks when the sky is dark enough for full observation.
Frequently asked questions
Times are computed in solar time based on longitude offset from UTC. For most practical purposes this is very close to UTC for locations near the prime meridian.
Above the Arctic Circle or below the Antarctic Circle, the sun may not rise or set at all during parts of the year. The calculator shows "No sunrise" or "No sunset" for these polar day/night conditions.
Related
These related calculators come from the same leaf category, nearby sibling categories, or the same top-level topic.
Find hours of daylight for any location and date, with day-over-day change and solstice comparisons.
Measure the time between two dates in years, months, weeks, days, and business days.
Determine the moon phase, illumination percentage, and moon age for any date, with upcoming major phase dates.
Calculate golden hour and blue hour times for photography at any location and date, with morning and evening windows.
