Some stuff » earth shadow https://blog.yhuang.org here. Wed, 27 Aug 2025 08:50:58 +0000 en hourly 1 http://wordpress.org/?v=3.1.1 moon halo https://blog.yhuang.org/?p=680 https://blog.yhuang.org/?p=680#comments Wed, 12 Oct 2011 09:28:45 +0000 admin http://scripts.mit.edu/~zong/wpress/?p=680 http://apod.nasa.gov/apod/image/0812/moonhalo_casado_big.jpg Today I looked up at the night sky and there was this wonderfully full moon, but it was sitting in the middle of a huge perfectly round disk opening into the heavens amidst the clouds. I wondered what the heck it was, thinking it might be the result of Earth-shadow.

It turns out this was a moon halo. The page says that the phenomenon is “familiar,” but I’ve never seen it in my life, and had I not looked up for no reason, I would have missed this one, too! By my hand measurement, it spanned 45° in diameter, which is a pretty big portion of the sky. Jupiter was also visible within the ring of the halo. Quite amazing.

]]> https://blog.yhuang.org/?feed=rss2&p=680 1