ATRONOMY – OLAR PHYIC (28) CALCULATOR
Solar Declination
A precise tool.
What is the Solar Declination & How does it work?
Solar declination describes the angular position of the Sun relative to the celestial equator, varying throughout the year due to Earth’s axial tilt.
It reaches its maximum northward value at the June solstice and its maximum southward value at the December solstice, influencing day length and solar altitude.
The declination can be approximated analytically using the day of the year, which is the basis of many solar‑position calculators.
\delta = 23.44^{\circ} \sin\left(\frac{2\pi}{365}(N-81)\right)
\delta = solar declination (degrees), N = day of year (1–365)
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Frequently Asked Questions
What is solar declination?
Solar declination is the angle between the Sun’s rays and the Earth’s equatorial plane, varying throughout the year.
How does solar declination affect day length?
As solar declination changes, it influences the duration of daylight hours at different latitudes.
When is solar declination at its maximum value?
Solar declination reaches its maximum northward value on the June solstice and its maximum southward value on the December solstice.
What formula is used to calculate solar declination?
The formula used is (delta = 23.44^{circ} sinleft(frac{2pi}{365}(N-1)right)), where N is the day of the year.
How does Earth’s axial tilt cause solar declination?
Earth’s axial tilt causes the Sun to appear higher in the sky at certain times of the year, leading to changes in solar declination.
Can I use this calculator for any location on Earth?
Yes, the calculation is based on the day of the year and does not depend on specific geographic location.
Results are for informational purposes only and do not constitute professional advice.