periastron effect近星点效应
time periastron近心点时间
advance of periastron拱线运动;[天] 近星点前移;[天] 近星点进动
longitude of periastron近星点经度
N（名词） the point in the orbit of a body around a star when it is nearest to the star, esp applied to double-star systems 近星点 [astronomy]