Concept
Perihelion
The closest point in an orbit to the Sun.
Earth reaches perihelion in early January each year at about 147.1 million km from the Sun.
Overview
Earth reaches perihelion in early January each year at about 147.1 million km from the Sun.
See also
Perigee
The closest point in an Earth-centred orbit.
Aphelion
The farthest point in an orbit from the Sun.
Apogee
The farthest point in an Earth-centred orbit.
Exoplanets
Worlds orbiting other stars.
Obliquity
The tilt of a planet's axis to its orbit.
Milankovitch Cycles
Slow orbital changes that drive Earth's ice ages.