parsec

['pɑːsek] [ 'pɑr,sɛk]
相关单词 kiloparsecmegaparsec
英英词典释义
  • Noun
    1. a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
行业词典
  • 天文学: 秒差距;又称 :秒差距(pc);天体距离的一种单位。1pc等于恒星周年视差为1″(角秒)的距离,约等于3.26光年。;