光こう年ねん

Usage patterns

• 〈数かず〉光こう年ねんa distance of X light-years

  その星ほしは地ち球きゅうから4光こう年ねん離はなれている。

  That star is four light-years away from Earth.

• 光こう年ねんの彼か方なたfar away, measured in light-years (often figurative)

  彼かれの実じつ力りょくとは光こう年ねんの彼か方なたに差さがある。

  There's a gap of light-years between his skill and mine.