siriometer

兆(天文单位)

词形变化

siriometers 复数 siriometers

释义与例句

n.
  1. 1.

    A unit of distance equal to one million astronomical units or 15.813 light-years.

词源

From Sirius and meter. It is roughly twice the distance from Earth to the star Sirius.

来源：wiktionary