資料來源 : pyDict

近星點

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Periastron \Per`i*as"tron\, n. [NL., fr. Gr. ? about + ? a
   star.] (Astron.)
   That point, in the real or apparent orbit of one star
   revolving around another, at which the former is nearest to
   the latter.