expression, noun
Winter Triangle
An asterism formed by the bright stars Betelgeuse, Sirius, and Procyon, visible in the winter night sky.
冬の大三角は、オリオン座のベテルギウス、おおいぬ座のシリウス、こいぬ座のプロキオンからなる。
The Winter Triangle consists of Betelgeuse in Orion, Sirius in Canis Major, and Procyon in Canis Minor.
From 冬 (winter) + の (possessive particle) + 大三角 (large triangle), referring to the prominent triangular asterism visible in winter.