The Sun's declination refers to

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The Sun's declination is defined as the angular distance of the Sun from the celestial equator. It is the angle between the Sun's rays and the plane of the Earth's equator. This angle changes over the course of the year and is responsible for the seasonal changes in the amount and angle of incoming solar radiation at different latitudes. Direct overhead insolation is received at the latitude where the Sun's declination is equal to the latitude.

The Sun's Declination Refers to