noun
perihelion
Astronomical term for the point in a celestial body's orbit where it is closest to the sun. The opposite is 遠日点 (aphelion).
See also: 遠日点
地球は1月に近日点を通過する。
The Earth passes through perihelion in January.
近日点と遠日点では太陽からの距離が大きく異なる。
The distance from the sun differs greatly between perihelion and aphelion.