冬季大圆环：黎明前的晨间观测

冬季大圆环并非一个星座，而是一个由多个星座中的恒星组成的星群。这一壮观的天文图案在黎明前的清晨清晰可见。

The majestic Winter Circle isn't a constellation. This giant circle - or hexagon - is an asterism, or a pattern made up of stars from several constellations. The post The Winter Circle: Catch in the morning before dawn first appeared on EarthSky .