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Mo's photosThis morning's noctilucent cloud.02:42 to 03:08, Fife in eastern <a href="https://photog.social/tags/Scotland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Scotland</a>.<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://photog.social/tags/Astrodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#Astrodon</a> <a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a> <a href="https://photog.social/tags/WeatherPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#WeatherPhotography</a>

Tuomas Aumala<a href="https://tech.lgbt/@Natasha_Jay" class="u-url mention" rel="nofollow noopener" target="_blank">@Natasha_Jay</a> With how bright and low that is to the horizon, I'm inclined to think that it might be a rainbow. A CHA would get fainter and fainter as the Sun approaches the altitude of 58°, after which the halo can no longer form. Still a very striking photo. Perfect timing with the Sun and the rain in just the right places! <a href="https://mementomori.social/tags/atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#atoptics</a> <a href="https://www.atoptics.org.uk/halo/chaform.htm" rel="nofollow noopener" translate="no" target="_blank">https://www.atoptics.org.uk/halo/chaform.htm</a>

Mo's photosWhorledM31 (Messier 31 and NGC 224) also commonly known as the Andromeda Galaxy, the nearest major galaxy to our Milky Way. Two satellite galaxies are also in the frame, M32 (Messier 32 and NGC 221) is on the left and M110 (Messier 110 and NGC 205) is on the right.Taken from Fife in eastern <a href="https://photog.social/tags/Scotland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Scotland</a>, February 27th 2025 at 20:15.<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/StarGazing" class="mention hashtag" rel="nofollow noopener" target="_blank">#StarGazing</a> <a href="https://photog.social/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's Iceland photosShining ThroughAbove the town of Egilsstaðir¹ in eastern <a href="https://icelandphotos.co.uk/tags/Iceland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Iceland</a>, the show is beginning.Amongst the many visible stars there is part of Ursa Major (Great Bear, Plough or Big Dipper) in the upper right and Corona Borealis (The Northern Crown) which looks like a smiley face is centre left.¹ 𝘼𝙞-𝘬𝘪𝘭𝘭𝘴-𝘴𝘵𝘢-𝘵𝘩𝘳𝘳<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://icelandphotos.co.uk/tags/AuroraTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#AuroraTuesday</a> <a href="https://icelandphotos.co.uk/tags/NorthernLights" class="mention hashtag" rel="nofollow noopener" target="_blank">#NorthernLights</a> <a href="https://icelandphotos.co.uk/tags/aurora" class="mention hashtag" rel="nofollow noopener" target="_blank">#aurora</a> <a href="https://icelandphotos.co.uk/tags/AuroraBorealis" class="mention hashtag" rel="nofollow noopener" target="_blank">#AuroraBorealis</a> <a href="https://icelandphotos.co.uk/tags/LandscapePhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#LandscapePhotography</a> <a href="https://icelandphotos.co.uk/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://icelandphotos.co.uk/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's photosThank you all so much for your kind birthday wishes! So much genuine affection, I have a little tear in my eye now. Or perhaps that's just the hangover... 😆 I had a lovely day with lots of phone calls, plenty of laughter and good company. What more could I possibly ask for?My friends are still here so I must be away and make breakfast.I leave you with a photo of the <a href="https://photog.social/tags/aurora" class="mention hashtag" rel="nofollow noopener" target="_blank">#aurora</a>, a lovely image for a lovely bunch of people!<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/Iceland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Iceland</a> <a href="https://photog.social/tags/NorthernLights" class="mention hashtag" rel="nofollow noopener" target="_blank">#NorthernLights</a> <a href="https://photog.social/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's Iceland photosThank you all so much for your kind birthday wishes! So much genuine affection, I have a little tear in my eye now. Or perhaps that's just the hangover... 😆 I had a lovely day with lots of phone calls, plenty of laughter and good company. What more could I possibly ask for?My friends are still here so I must be away and make breakfast.I leave you with a photo of the <a href="https://icelandphotos.co.uk/tags/aurora" class="mention hashtag" rel="nofollow noopener" target="_blank">#aurora</a>, a lovely image for a lovely bunch of people!<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://icelandphotos.co.uk/tags/Iceland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Iceland</a> <a href="https://icelandphotos.co.uk/tags/NorthernLights" class="mention hashtag" rel="nofollow noopener" target="_blank">#NorthernLights</a> <a href="https://icelandphotos.co.uk/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://icelandphotos.co.uk/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's Iceland photosDiffuse Aurora, Bortle 3Just before an <a href="https://icelandphotos.co.uk/tags/auroral" class="mention hashtag" rel="nofollow noopener" target="_blank">#auroral</a> display begins, the first hints of light are faint and spread across a large area of sky. If you're lucky, you might catch one.Bortle Scale shows the amount of artificial light in the area, where 1 is the darkest and 9 has most light pollution.These two things came together beautifully for us.Grenivík in Grýtubakkahreppur¹, NE <a href="https://icelandphotos.co.uk/tags/Iceland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Iceland</a>.¹ 𝙂𝙧𝙚𝙚-𝘵𝘰𝘰-𝘣𝘢𝘬𝘬𝘢-𝘬𝘩𝘳𝘳𝘦𝘱-𝘳𝘳<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://icelandphotos.co.uk/tags/AuroraTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#AuroraTuesday</a> <a href="https://icelandphotos.co.uk/tags/NorthernLights" class="mention hashtag" rel="nofollow noopener" target="_blank">#NorthernLights</a> <a href="https://icelandphotos.co.uk/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://icelandphotos.co.uk/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's photosNight Shining3am. Sometimes, insomnia is useful.<a href="https://photog.social/tags/Noctilucent" class="mention hashtag" rel="nofollow noopener" target="_blank">#Noctilucent</a> clouds (NLCs) are made of water ice crystals that form below -120°C (-184°F) and at ≈ 76-85km (47-53mi), the highest clouds in our atmosphere.NLCs are only visible during twilight and usually summer from latitudes of ±50° and ±70°, and when the lower atmosphere are in Earth's shadow but these clouds are in sunlight.Text derived from <a href="https://en.wikipedia.org/wiki/Noctilucent_cloud" rel="nofollow noopener" translate="no" target="_blank">https://en.wikipedia.org/wiki/Noctilucent_cloud</a><a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/Scotland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Scotland</a> <a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a> <a href="https://photog.social/tags/AstroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#AstroPhotography</a> <a href="https://photog.social/tags/Comet" class="mention hashtag" rel="nofollow noopener" target="_blank">#Comet</a> <a href="https://photog.social/tags/Astro" class="mention hashtag" rel="nofollow noopener" target="_blank">#Astro</a>

Mo's Iceland photosAuroral Cycle<a href="https://icelandphotos.co.uk/tags/Aurora" class="mention hashtag" rel="nofollow noopener" target="_blank">#Aurora</a> goes through three phases: growth, expansion and recovery.The growth usually starts ≈ an hour before expansion. This is when we see a rise in the magnetometers and a subtle arc begins to appear over the horizon.Expansion is when the sky dances.In recovery, the intense activity of expansion is waning, the magnetometers are returning to background levels and the bands of light become discontiguous before fading away.<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://icelandphotos.co.uk/tags/Iceland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Iceland</a> <a href="https://icelandphotos.co.uk/tags/AuroraTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#AuroraTuesday</a> <a href="https://icelandphotos.co.uk/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a>

Mo's photosPSCsNacreous or polar stratospheric clouds form in the winter stratosphere, at altitudes of 15 to 25 km (9 to15.5 miles) and at very low temperatures below −78 °C (−108 °F) They are seen in winter when the sun is below the horizon, shining brightly well before dawn or after dusk. This type of PSC is composed of super-cooled ice crystals which are not harmful to the atmosphere.These were seen from my bedroom window in December last year.<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a> <a href="https://photog.social/tags/Scotland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Scotland</a> <a href="https://photog.social/tags/WeatherPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#WeatherPhotography</a>

Christian Sievers<a href="https://photog.social/@SilverRainbow" class="u-url mention" rel="nofollow noopener" target="_blank">@SilverRainbow</a> I like <a href="https://mastodon.social/tags/atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#atoptics</a> <a href="https://mastodon.social/@Sie/112891295478503663" rel="nofollow noopener" translate="no" target="_blank">https://mastodon.social/@Sie/112891295478503663</a>

jenbanim<a href="https://photog.social/@SilverRainbow" class="u-url mention" rel="nofollow noopener" target="_blank">@SilverRainbow</a> great photo! I think it would be cool to get an <a href="https://mastodo.neoliber.al/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a> (for atmospheric optics) hashtag going on fedi. There's a subreddit with the name and it's one of my favorites<a href="https://reddit.com/r/atoptics/" rel="nofollow noopener" translate="no" target="_blank">https://reddit.com/r/atoptics/</a>

Mo's photosSuperb Halo8:30 am in late March and, through my bedroom window, an icy sky and the rising sun combined to create this lovely spectacle. As well as a 22° halo (the circle around the sun) this strong display is also showing a sundog (22° parhelion) on each side of the sun, a parhelic circle (crossing the circle and passing through both sundog spots,) an upper tangent arc (at the top of the circle,) and a sun pillar (going up from the sun.)<a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener" target="_blank">@photography</a><a href="https://photog.social/tags/AtOptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtOptics</a> <a href="https://photog.social/tags/Scotland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Scotland</a> <a href="https://photog.social/tags/WeatherPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#WeatherPhotography</a>

jenbanim<a href="https://social.beachcom.org/@nasa" class="u-url mention" rel="nofollow noopener" target="_blank">@nasa</a> <a href="https://mastodo.neoliber.al/tags/atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#atoptics</a> Hopefully this hashtag can one day be a thing, what a beautiful photo

jenbanimA 22 degree halo and a parhelic circle in Eastern Oregon photographed by my parentsThe offset circle is exceptionally rare. As far as I know this is one of, at most, a couple dozen photos of a complete parhelic circle ever taken<a href="https://mastodo.neoliber.al/tags/Atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#Atoptics</a> <a href="https://mastodo.neoliber.al/tags/ParhelicCircle" class="mention hashtag" rel="nofollow noopener" target="_blank">#ParhelicCircle</a> <a href="https://mastodo.neoliber.al/tags/22DegreeHalo" class="mention hashtag" rel="nofollow noopener" target="_blank">#22DegreeHalo</a>

ArgentCorvidSaw a 22° Halo and a circumhorizontal arc today at the kid's elementary school track and field day <a href="https://mstdn.social/tags/atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#atoptics</a>

Tuomas Aumala<a href="https://mastodon.social/@sundogplanets" class="u-url mention" rel="nofollow noopener" target="_blank">@sundogplanets</a> Nice! A lot more than just sundogs there. Even a bit of an upper tangent arc.<a href="https://mementomori.social/tags/atoptics" class="mention hashtag" rel="nofollow noopener" target="_blank">#atoptics</a>

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