Calculate sunrise, sunset, twilight times, and day length using astronomical formulas.
Times are calculated for the specified location and date using astronomical formulas. Actual times may vary slightly due to atmospheric conditions.
Select a date and enter latitude/longitude coordinates (or click "Use My Location"). Click "Calculate" to see sunrise, sunset, solar noon, day length, and civil twilight times. The calculator uses precise astronomical algorithms including solar position calculations, equation of center, and ecliptic longitude. Default location is Taipei (25.033°N, 121.5654°E).