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Hashtag
#atoptics
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More than a hint of a fogbow too. #atoptics
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A circular fisheye lens pointed straight up at the waxing gibbous moon which is circled by a 22° halo. There is a layer of cirrus covering most of the sky, but some stars are visible including the constellation Orion to the right of the halo.
I went with a circular fisheye pointed up on one camera last night because I suspected the clouds moving in would produce a 22° halo and sure enough!
#atoptics #astrophotography
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Here's highlights of my #timelapse for Dec 26-27, 2025 from Crestone, Colorado USA.
We had some nice cloud iridescence around the moon last night. There was also a little lightning in the valley!
Full video at youtu.be/EK1QyHcoxSU
#astronomy #astrophotography #COwx #atoptics
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The rise of the Belt of Venus, the shadow of the Earth on the atmosphere, this evening. #atoptics #atmosphericoptics
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I’ve just seen this today, about a quarter of an hour before sunset. If I’m not mistaken that’s known as an upper tangent arc.
en.wikipedia.org/wiki/Tangent...
#atmosphericoptics #atoptics #photography
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The Sun appears just over a building, and two fainter false suns appear to the left and right in what is known as a sun dog.
Saw a pretty good Sun Dog today. Hard to photograph as the sun was very bright and still pretty high above the horizon. Very distinct false suns to both the left and right.
#SunDog #Atoptics
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#atoptics - *what* is going on with that rainbow?
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Photo of a brilliant rainbow with second order bow and supernumeraries.
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Photo showing an upper tangent arc halo in Ústí nad Labem, Czech Republic.
Upper tangent arc just now as I am waiting for my train. #icehalo #atoptics
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Atmospheric optics, various halos including a Wegener arc, photo from Bath, UK 07/08/2025.
The parhelic circle with a brightning at the antisolar point and the Wegener arc intersecting with it.
S'teeth, never was there an #atoptics photo where the photographer, at the time, recognised so little of what they saw. Faint 22 degree halo, plus... a circumscribed halo, a complete parhelic arc, and what was probably a complete Wegener arc too. @pennyend.bsky.social might like this.
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Complete parhelic circle. #atoptics
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Halo and circle, from Bath.
Rare #atoptics circle over SW England right now. Look for the complete circle at the sun's altitute & around the zenith. Phone snapshot below.
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Night-time photo from a Scottish city, showing colorful light pillars each ending with a bifuraction that gives impression of a vaulted structure. These bifurcations are most likely upper tanget arcs, a type of ice halo.
Very interesting ice halo display from Scotland. What we see here are light pillars from city lights capped with what appears to be upper tangent arcs, with possible coincident suncave Parry arc. #icehalo #atoptics
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Photo of a 22° halo with upper tanget arc, sundogs and subsun, all created on diamond dust. Photo from French Alps.
Beautiful diamond dust halo in French Alps. Source: redd.it/1i4jrnb
#icehalo #atoptics
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Variety of color of light pillars at this airport in the distance. December 11, 2024.
Driving toward light pillars shining tall looking west. December 11, 2024.
Light pillars looming west over a highway. December 11, 2024
Light pillars overlooking the eastern side of Watertown. December 11, 2024
Light pillars this morning in Watertown, South Dakota. This stuff never gets old.
#sdwx #atoptics #photography
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Photo showing a bright circumzenithal arc with some dark spruce tree sillhouetes against a steel gray sky.
The photo doesn't show a rainbow. It's an example of atmospheric optics phenomena known as ice halos. They are not caused by sunlight refracting in water droplets like rainbows but in ice crystals and there's veritable menagerie of them. Let's have a 🧵 about them. 1/17
#icehalo #halos #atoptics
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Light pillars shining high behind a grove of trees and hay bales in the rural countryside of South Dakota. Wind blown snow and very cold temperatures made for a great display of light refractions. Shot near Watertown, SD on December 4, 2024.
A lone tree without its leaves, snow on the ground, and distant light pillars in rural countryside outside of Watertown, South Dakota on December 4, 2024.
Beam me up, Scotty! Incredible display of light pillars last night in Watertown, South Dakota.
The -20°F wind chill and strong winds were brutal but it was great to get back in the elements after a long month of not picking up my camera.
#sdwx #atoptics #photography
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Photograph of a corona (atmospheric phenomenon).
Takováto slabá irizace je dost častá. Hezká a výrazná už je mnohem méně obvyklá, ale taky není nijak extrémně vzácná.
#atoptics
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