Aphelion
the point in the path of a celestial body (as a planet) that is farthest from the sun.
Etymology:
New Latin, from apo- + Greek hēlios sun
First Known Use: 1656
Perihelion
the point in the path of a celestial body (as a planet) that is nearest to the sun
Etymology:
Etymology:
New Latin, from peri- + Greek hēlios sun
First Known Use: 1666
