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Astronomy
Calculate daylight hours, sunrise, and sunset times for any location and date
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
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Tool usage guide
The Daylight Calculator computes precise daylight hours, sunrise, and sunset times for any global location and date. Input latitude, longitude, and a date to receive accurate astronomical data in JSON format.
Background
An event planner is organizing an outdoor festival in New York City on June 21st, the longest day of the year.
Problem
Need exact sunrise and sunset times to schedule activities from dawn to dusk.
How to use
Set latitude to 40.7128, longitude to -74.0060, and date to 2026-06-21.
Outcome
The tool returns JSON with sunrise at 5:25 AM UTC, sunset at 8:30 PM UTC, and 15 hours and 5 minutes of daylight.
Background
A gardener in Seattle wants to plan winter planting on December 21st, the shortest day, to choose plants suited to low light.
Problem
Determine daylight duration to select plants that thrive with limited sunlight exposure.
How to use
Input latitude 47.6062, longitude -122.3321, and date 2026-12-21.
Outcome
Results show sunrise at 7:55 AM UTC, sunset at 4:20 PM UTC, with 8 hours and 25 minutes of daylight.
Calculations are based on standard astronomical formulas and are highly accurate for most practical purposes.
Yes, you can input any valid date, past or future, within the tool's supported range.
Use online maps or geolocation tools to find the latitude and longitude for your specific location.
Output times are provided in UTC; you may need to convert them to your local time zone manually.
No, the tool processes one date per calculation; run it separately for each date you need.