1(in the northern hemisphere) two stars of the Plough or Big Dipper in Ursa Major, through which a line points nearly to the Pole Star.

1. 1.1 (in the southern hemisphere) two stars in the constellation Crux, through which a line points nearly to the south celestial pole.
   〔天文〕（北半球）（大熊星座中的）两颗北极指极星