LIFETYLE & UTILITIE CALCULATOR
Day Length Calculator
A precise tool.
What is the Day Length Calculator & How does it work?
The length of daylight hours on a given date varies depending on the latitude and time of year due to Earth’s axial tilt and its revolution around the Sun. This variation is most pronounced at higher latitudes, where days can be very long during summer solstice and very short during winter solstice.
The formula to calculate daylight hours involves spherical geometry and trigonometry. The key parameters include the declination angle of the Sun ((delta)), the latitude of the observer ((phi)), and the solar hour angle ((H)).
(N = frac{1}{pi} cdot arccos(-tan(phi) cdot tan(delta)))
N = number of daylight hours, (phi) = latitude, (delta) = declination angle
Parameters
Result
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Frequently Asked Questions
How do I calculate daylight hours for my location?
Use this calculator by entering your date and latitude to find out how many hours of daylight you will have.
What is the declination angle of the Sun?
The declination angle is the angle between the Earth's equatorial plane and a line from the center of the Earth to the Sun. It varies throughout the year due to the tilt of the Earth's rotational axis.
Why are daylight hours longer in summer than in winter?
Daylight hours are longer in summer because the Northern or Southern Hemisphere is tilted towards the Sun, causing more direct sunlight and longer days.
Can I use this calculator for any location on Earth?
Yes, you can enter any latitude to calculate daylight hours for that specific location.
How accurate is this daylight hours calculation?
This calculation provides a good estimate of daylight hours but may not account for local topography or atmospheric conditions.
What is the impact of latitude on daylight hours?
Latitude significantly affects daylight hours. Higher latitudes experience more extreme variations in day length between summer and winter compared to lower latitudes.
Can I use this calculator for historical dates?
Yes, you can input any past date to find out the daylight hours for that specific time and location.
Results are for informational purposes only and do not constitute professional advice.