銀ぎん河が赤せき道どう

noun

galactic equator

Astronomical term for the great circle on the celestial sphere that passes through the Milky Way and is inclined to the celestial equator.

• 銀ぎん河が赤せき道どうは天あまの川がわに沿そって描えがかれる大だい円えんです。

  The galactic equator is a great circle drawn along the Milky Way.