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Astronomy Picture of the Day -- Alaskan Moondogs
NASA ^ | Monday, March 21, 2016 | (see photo credit)

Posted on 03/21/2016 10:46:18 AM PDT by SunkenCiv

Explanation: What's happened to the sky? Moonlight illuminates a snowy scene in this night land and skyscape made on 2013 January from Lower Miller Creek, Alaska, USA. Overexposed near the mountainous western horizon is the first quarter Moon itself, surrounded by an icy halo and flanked left and right by moondogs. Sometimes called mock moons, a more scientific name for the luminous apparitions is paraselenae (plural). Analogous to a sundog or parhelion, a paraselene is produced by moonlight refracted through thin, hexagonal, plate-shaped ice crystals. As determined by the crystal geometry, paraselenae are seen at an angle of 22 degrees or more from the Moon. Compared to the bright lunar disk, paraselenae are faint and easier to spot when the Moon is low.

Monday, March 21, 2016

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: alaska; apod; astronomy; cliffrobertson; gidget; jamesdarrin; louisthomashardin; moondog; moondoggy; sandradee; science
[Credit and Copyright: Sebastian Saarloos]

1 posted on 03/21/2016 10:46:19 AM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; disndat; KoRn; Grammy; steelyourfaith; Mmogamer; dayglored; ...

I just realized that I made a minor omission in the prebuilt post-an-APoD links maker, will have to fix that.
The Big One

2 posted on 03/21/2016 10:49:59 AM PDT by SunkenCiv (Here's to the day the forensics people scrape what's left of Putin off the ceiling of his limo.)
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To: SunkenCiv; cracker45; Tainan; Jet Jaguar; SENTINEL; redpoll; ArmyTeach; Eska; hattend; hosepipe; ...

Alaska Ping!

It's a Literal Halo.

3 posted on 03/21/2016 11:09:39 AM PDT by KC_Lion (Trump supporters aren't bought and paid for, Cruz supporters aren't establishment shills, okay? Good)
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