Monday, April 28, 2008


I'm Being Followed by a Moon Shadow

The ice crystal filled sky over Iceland put on quite a display a few nights ago. Almost all the atmospheric lights are visible (except a rainbow). There are moon dogs on either side of the moon just at the conjunction of a 22 degree halo and a parahelion circle. There is also an upper tangent arc on top of the halo. Less visible to me are a rare circumzenithal arc and an even rarer supralateral arc.

I don't see those last two but experts assure me they are there and here is a different, slightly enhanced photo with them pointed out. What a lovely planet we inhabit.

(h/t Spaceweather and Agust Gudmundsson)


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