By Jeff Schreier | 2017-12-21
🌚 22º Lunar Halo
On 12/15/2024 10:30 pm by Rui Santos| Amor, Leiria - Portugal
Still from the last full moon night, at 10:30 pm, I noticed that the 22º halo that I had noticed 2 nights ago, was happening again, but this time, with a more dense layer of clouds.
Tried my best to register the phenomenon around the backyard. 10 Minutes outside and I didn't feel my hands, how cold it was!
Explanation: A 22° lunar halo is a circular ring of light around the Moon caused by its light refracting through hexagonal ice crystals in high-altitude cirrostratus clouds. The halo forms at a consistent 22° radius due to the way light bends when entering and exiting the crystals.
It often appears faint, with subtle reddish and bluish hues from light dispersion. Best seen when the Moon is bright, it can signal approaching weather changes. Similar to solar halos, it highlights the interplay of light and atmospheric conditions.
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