noun
perihelion shift; advance of the perihelion
Technical term in astronomy referring to the gradual change in the orientation of an orbit's perihelion.
水星の近日点移動は一般相対性理論の検証に使われた。
The perihelion shift of Mercury was used to test general relativity.
Compound of 近日点 (perihelion) and 移動 (shift, movement).