earth space layer
Day length
Explore calculated daylight duration for each country's representative location.
Methodology
Day length is calculated from date, latitude, solar declination and the standard sunrise/sunset altitude; representative country coordinates are used rather than observations.
Coverage & source
- Source
- Astronomical calculation
- Period
- Calculated on request
- Frequency
- Daily calculation
Rankings, where shown, describe only countries with comparable values in the selected period.