Sunrise and Sunset Calculator

About Sunrise and Sunset

Sunrise and sunset are the base for Panchang, Rahu Kaal, Choghadiya, Hora and day-length calculations.

Understand sunrise, dawn and the three twilight boundaries

See why the earliest sunset and shortest day differ

Understand equinox, equilux and local daylight duration

Understand sunrise direction and seasonal changes in azimuth

Explore the Sun's figure-eight analemma with a calculated diagram

Understand solar-eclipse magnitude and covered disc area

Understand Zero Shadow Day and the Sun at the zenith

Understand why atmospheric refraction flattens the Sun

Understand Venus phases and morning/evening appearances

Understand Mars retrograde motion through geometry

Understand perihelion, aphelion and seasonal geometry

Understand polar daylight, night and twilight

Understand atmospheric refraction and apparent solar altitude

Understand ecliptic longitude, right ascension and declination

Calculate local altitude and azimuth from hour angle

Calculate the angle between two sky directions

Calculate position angle east of celestial north

Understand parallactic angle and field rotation

Understand airmass, altitude and atmospheric path length

Calculate stellar magnitude, flux ratios and combined brightness

Understand stellar parallax, parsecs and distance uncertainty

Calculate transverse speed from stellar proper motion

Calculate radial velocity from Doppler shifts

Calculate stellar temperature with Wien’s law

Calculate stellar luminosity and radius

Calculate stellar distance with extinction correction

Understand telescope resolution and camera sampling

Calculate orbital periods with Kepler’s third law

Calculate orbital speed and escape velocity

Calculate Hohmann transfer burns and travel time

• Location-based sunrise
• Location-based sunset
• Foundation for Panchang calculations

Important Notes

• Visible times can vary slightly by terrain and atmospheric conditions.
• Religious Panchang uses standard astronomical definitions.