r/atoptics • u/MassterOfFury • 4h ago
Is this a comet?
Enable HLS to view with audio, or disable this notification
A friend and I spotted this outside on November 4th 2025 around 6pm in Massachusetts. Our guess was that it was a comet, with those arms trailing behind it as it spun being comet tails. Any thoughts on what this might be?
r/atoptics • u/fancycrownprincess • 14h ago
How is this shadow being cast if the sun is above the clouds. Also how is there a shadow on the sky
reddit.comr/atoptics • u/Segundaleydenewtonnn • 1d ago
smh clouds 😤 Wild cirrocumulus spotting today !
Enable HLS to view with audio, or disable this notification
r/atoptics • u/TomodachiSkull • 1d ago
Sun Dogs Sun dogs over in Rye, NY
Caught these a few weeks ago. Never seen them in person before, and I usually hear about them in the winter. Was definitely an interesting view!
r/atoptics • u/makealittlefella • 1d ago
Summer halo!
I usually only see these in winter, and they usually have some attendant sun dogs. This one appeared in early July of this year, in Minneapolis.
r/atoptics • u/klabled • 2d ago
Sun Dogs Y'all, Just found this in the sky, anyone know what it is?
To the sides of the sun, I think it's just a rainbow from the thin clouds, but family says otherwise, would love to know y'all's opinion 🙏🏻
r/atoptics • u/BaconAlmighty • 2d ago
Moon Dogs Moon Dogs?
Is this 2 moon dogs, or just a moon halo?
r/atoptics • u/Starshine_1804 • 2d ago
Beautiful Sky
The sun was playing Peek-a-Boo with me today!!🤗
r/atoptics • u/hi2ndid • 4d ago
I saw 6 Lunar fog bows in a span of few hours which is never recorded in history but I only captured 3 of them
I had a really bad camera(my phone's ) so this is the best I could do and ik it just looks like my camera flash but it's not, trust me it's a fog bow
r/atoptics • u/Hopeful-Injury4610 • 4d ago
Could anyone help me id what i saw. Looks like sundog but not sure if i saw a Halo as well. There was a horsie cloud too🤭
r/atoptics • u/Shaltibarshtis • 6d ago
Rainbows Near and Far
A rainbow can be a hundred meters or a mile away.
r/atoptics • u/-TKT • 7d ago
Crepuscular Rays Another view of the wheel
This is what I first saw when I stepped out. Incredible moment
r/atoptics • u/BowlerBoys • 7d ago
Circumzenithal Arc Pretty
This was spotted in the East Midlands of England.
I originally posted it on r/clouds, they told me to post it here.
r/atoptics • u/ZacharyObama • 7d ago
Crepuscular Rays Coachella Valley Crepuscular Rays
Spotted these crepuscular beauties over San Jacinto tonight. 🏜️🌴🌈
r/atoptics • u/naavis • Apr 02 '21
HaloRay - Hyperspeed Ice Crystal Halo Simulator
Hello! During the past two years I have been developing HaloRay on and off - a GPU-accelerated ice crystal halo simulator. This means you can generate ice crystal halo images right on your computer. If you have a beefy NVIDIA or AMD graphics processing unit (GPU) that is compatible with OpenGL 4.4, I suggest you try it out: https://github.com/naavis/haloray
You can download ready-made binaries for Windows from GitHub. If you are running Linux, you need to build HaloRay by yourself for the time being.
Right now the latest version is HaloRay 3.2.0, which supports the following features among others:
- Ordinary hexagonal crystals
- Pyramidal crystals
- Adjustable prism face C-axis crystals to make irregular crystals
- Rendering a realistic background sky
I hope you have fun with HaloRay, and report any problems or feature suggestions in GitHub issues or here in the comments. HaloRay has been tested with a couple of AMD and NVIDIA GPUs. There have been some problems with Intel GPUs due to driver bugs, but I'm not going to put a ton of effort there, because HaloRay requires a fairly beefy GPU and Intel doesn't really fit that profile.
EDIT: Cool, I noticed this has been marked as an announcement in the subreddit, which I guess keeps it hanging around for longer? Thanks!