Calculate civil, nautical, and astronomical twilight times. Know when the sky transitions between day and night.
Enter your values below
Your geographic latitude.
Your geographic longitude.
Date to calculate twilight for.
Select civil, nautical, or astronomical twilight.
How this calculator works
Calculates twilight periods based on the Sun's depression angle below the horizon for each twilight type.
Common questions about this calculator
These calculators are for informational purposes only. While we strive for accuracy, results should not be used as the sole basis for important decisions.
