Orbit dari pergererakan bumi berbentuk elips, dengan jarak yang bervariasi tiap tahunnya disaat bumi mengitari matahari. Iradiasi matahari dapat dihitingan dengan persamaan
Pergererakan earth orbit from an ellipse shape, a distance which varies each year when the earth orbits the sun. Solar irradiation can dihitingan by the equation
The Orbit of the Earth is elliptical, with varying distances each year when the Earth is around the sun. Sun irradiation can be blackened with equations