Sunrise & Daylight Calculator
Use this rising sun calculator to estimate sunrise time, sunset time, solar noon, and day length for a specific date and location.
Tip: Longitude is negative west of Greenwich and positive east. Latitude is negative in the southern hemisphere.
What is a Rising Sun Calculator?
A rising sun calculator is a practical tool that estimates when the sun appears above the horizon for a given location and date. In everyday language, that means it tells you the expected sunrise time. Most modern calculators also provide related outputs such as sunset, total daylight, and solar noon (the point when the sun is highest in the sky).
These calculations are useful for photographers, hikers, runners, gardeners, astronomers, and anyone planning activities around natural light. While weather can affect what you actually see, the geometric sunrise time is still the best baseline for planning.
How this calculator works
This page uses a standard astronomical approximation based on your date, latitude, longitude, and UTC offset. It computes the solar position and then estimates when the sun crosses a chosen zenith angle.
Inputs explained
- Date: The calendar day you want to analyze.
- Latitude: North/south position on Earth (−90 to +90).
- Longitude: East/west position (−180 to +180).
- UTC Offset: Your local time zone difference from UTC (e.g., -5, +1, +5.5).
- Twilight Definition: Chooses the solar angle used for the event time.
What the output means
- Sunrise: Estimated local clock time for sunrise.
- Sunset: Estimated local clock time for sunset.
- Solar Noon: Midpoint of daylight period.
- Day Length: Total time between sunrise and sunset.
Why sunrise time changes every day
Sunrise is not fixed because Earth’s axis is tilted and Earth orbits the sun. That combination changes both the sun’s apparent path and how long it stays above the horizon throughout the year. Your latitude matters a lot: high-latitude regions experience dramatic seasonal swings, while equatorial regions are relatively stable.
Clock time also changes with time zones and daylight saving shifts. That’s why entering the correct UTC offset is essential for a useful result.
Practical uses for sunrise calculations
Photography and videography
Golden hour begins shortly after sunrise. Planning with sunrise data helps you arrive early, scout angles, and capture better light.
Fitness and outdoor routines
Runners, cyclists, and hikers can schedule safer sessions with natural daylight in mind, especially in winter.
Gardening and agriculture
Daylight duration can influence planting decisions, crop monitoring, and irrigation timing.
Travel and stargazing
Knowing sunrise and twilight boundaries helps plan night-sky viewing windows and early-morning departures.
Accuracy notes and limitations
This calculator is excellent for planning, but no sunrise tool can guarantee visual conditions. Real-world visibility depends on local weather, terrain elevation, buildings, and atmospheric refraction variation. In polar and near-polar regions, the sun may not rise or set on some days; the calculator reports those edge cases.
- Use accurate coordinates for best results.
- Double-check UTC offset during daylight saving transitions.
- Treat times as estimates, then add a small buffer for field activities.
Quick FAQ
Is this calculator only for sunrise?
No. It also returns sunset, solar noon, and total daylight length.
What is the best twilight option?
For standard sunrise/sunset planning, use Official (90.833°). Use civil/nautical/astronomical values for low-light and sky-brightness planning.
Can I use decimal UTC offsets like +5.5?
Yes. The UTC offset field accepts decimal values.