Sunrise and sunset times are not looked up from a table — they are calculated fresh for any given date and location using the geometry of the Earth's rotation and orbit around the sun.
The core calculation
At its heart, the calculation figures out exactly when the sun's position crosses the horizon for a specific latitude and longitude, accounting for the Earth's axial tilt and its position in its yearly orbit. The same formula that predicts today's sunrise can predict sunrise for any date, past or future.
Why times change with the seasons
The Earth's axis is tilted relative to its orbital plane, which is the entire reason seasons exist. As the Earth moves around the sun, the tilt causes the sun's apparent path across the sky to shift higher or lower, lengthening or shortening the amount of time it spends above the horizon each day.
Why latitude matters so much
Locations near the equator see relatively little variation in day length across the year, while locations closer to the poles see dramatic swings — and beyond the Arctic and Antarctic circles, there are periods where the sun does not set or rise at all for weeks.
Why this is useful beyond curiosity
- Photographers rely on precise sunrise and sunset times to plan golden hour shoots.
- Religious observances in several traditions are tied to sunrise or sunset times.
- Outdoor event planning benefits from knowing exactly how much daylight will be available.
Check today's sun times.
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