3 calculators in this category
- Sunrise & Sunset Time CalculatorNOAA solar position algorithm (after Meeus, Astronomical Algorithms)Enter a latitude, longitude, date and UTC offset and this calculator returns sunrise, sunset, solar noon, day length and the…
- Daylight Hours & Day Length CalculatorNOAA solar position algorithm (after Meeus, Astronomical Algorithms)This calculator gives the hours of daylight at any latitude on any date, together with the change from the day before, the…
- Twilight Times CalculatorUSNO twilight definitions (−6°, −12°, −18° solar altitude)Twilight is defined by how far the Sun sits below the horizon, not by how the sky looks, and the three standard thresholds are…
Which one do you need?
- Sunrise & Sunset Time Calculator
- Calculate sunrise, sunset, solar noon and day length for any coordinates and date using the NOAA solar position algorithm, with horizon refraction and elevation.
- Daylight Hours & Day Length Calculator
- Calculate hours of daylight for any latitude and date, plus the day-over-day change, the longest and shortest days, and the full annual curve of photoperiod.
- Twilight Times Calculator
- Find civil, nautical and astronomical twilight times for any location and date, plus the golden hour and blue hour windows and the length of true darkness.