Perihelion and Aphelion – സുര്യസമീപദിനവും സുര്യവിദുരദിനവും

Perihelion is the point in the orbit of a celestial body (such as a planet or comet) that is closest to the sun. Aphelion is the point in the orbit of a celestial body (such as a planet or comet) that is furthest from the sun.