二に重じゅう星せい

noun

double star; visual double

Astronomical term for two stars that appear close together in the sky, either as a true binary system or an optical double.

• 望ぼう遠えん鏡きょうで見みると、あの星ほしは二に重じゅう星せいだとわかる。

  When viewed through a telescope, you can see that star is a double star.