Andy Casely
@deep-twilight.bsky.social
Planetary imager for fun, earth extreme weather for work, I like trail running, wild places, cool images, relaxing with cricket. Blue Mtns 🇦🇺
🪐 APOTY shortlist x6 (2019 planets win)
☀️ Malin awards wins 2021, 2024 (x2)
🚀 APOD x2
🪐 APOTY shortlist x6 (2019 planets win)
☀️ Malin awards wins 2021, 2024 (x2)
🚀 APOD x2
Reposted by Andy Casely
Want to see the aurora? Tonight might be the night!
There have been a bunch of coronal mass ejections (big flares of plasma) from the Sun that are all arriving at Earth today and tonight.
theconversation.com/aurora-likel...
There have been a bunch of coronal mass ejections (big flares of plasma) from the Sun that are all arriving at Earth today and tonight.
theconversation.com/aurora-likel...
Aurora likely tonight as string of solar flares heads for Earth
Four big outbursts from the Sun mean skies may light up much further from the poles than usual.
theconversation.com
November 12, 2025 at 5:20 AM
Want to see the aurora? Tonight might be the night!
There have been a bunch of coronal mass ejections (big flares of plasma) from the Sun that are all arriving at Earth today and tonight.
theconversation.com/aurora-likel...
There have been a bunch of coronal mass ejections (big flares of plasma) from the Sun that are all arriving at Earth today and tonight.
theconversation.com/aurora-likel...
Reposted by Andy Casely
Submit them to Aurorasaurus!!! They're an NSF funded project out of University of New Mexico that takes crowdsourced aurora observations for research purposes:
www.aurorasaurus.org
www.aurorasaurus.org
Aurorasaurus - Reporting Auroras from the Ground Up
Friends, see my real-time #aurora report on the aurorasaurus.org map! Follow us on www.facebook.com/aurorasaurus.org. Reporting #northernlights and #citizenscience from the ground up since 2012!
www.aurorasaurus.org
November 12, 2025 at 3:25 AM
Submit them to Aurorasaurus!!! They're an NSF funded project out of University of New Mexico that takes crowdsourced aurora observations for research purposes:
www.aurorasaurus.org
www.aurorasaurus.org
Reposted by Andy Casely
YES! THIS on GenAI!
Please read this absolutely splendid piece of writing that had me cheering, a little bit weepy, and writing in the margins:
"An extraordinary amount of money is spent by the AI industry to ensure that acquiescence is the only plausible response. But marketing is not destiny."
Please read this absolutely splendid piece of writing that had me cheering, a little bit weepy, and writing in the margins:
"An extraordinary amount of money is spent by the AI industry to ensure that acquiescence is the only plausible response. But marketing is not destiny."
Large Language Muddle | The Editors
The AI upheaval is unique in its ability to metabolize any number of dread-inducing transformations. The university is becoming more corporate, more politically oppressive, and all but hostile to the ...
www.nplusonemag.com
September 29, 2025 at 7:07 PM
YES! THIS on GenAI!
Please read this absolutely splendid piece of writing that had me cheering, a little bit weepy, and writing in the margins:
"An extraordinary amount of money is spent by the AI industry to ensure that acquiescence is the only plausible response. But marketing is not destiny."
Please read this absolutely splendid piece of writing that had me cheering, a little bit weepy, and writing in the margins:
"An extraordinary amount of money is spent by the AI industry to ensure that acquiescence is the only plausible response. But marketing is not destiny."
My social media manager for this one is Helen, but I'm pretty chuffed to win the Solar System category at the Malins for the third time in the last five years (move over Brisbane Lions, I'm doing back-to-back wins too 🤣). Congrats to the other winners and finalists too, some great images again
Proud of @deep-twilight.bsky.social, following his 2024 Solar System category win in the Malin awards (Australia's premier Astrophoto comp) with another in 2025. This time for a beaut sequence of Saturn through equinox.
September 27, 2025 at 2:04 PM
My social media manager for this one is Helen, but I'm pretty chuffed to win the Solar System category at the Malins for the third time in the last five years (move over Brisbane Lions, I'm doing back-to-back wins too 🤣). Congrats to the other winners and finalists too, some great images again
Reposted by Andy Casely
Cecilia Payne-Gaposchkin ✨ figured out what stars are made of ✨ when she was just 25. 🔭🧪
Her PhD thesis basically established the Harvard astro department — at a time when Harvard didn't officially allow woman students.
I wrote this little profile to mark the 100th anniversary of her thesis:
Her PhD thesis basically established the Harvard astro department — at a time when Harvard didn't officially allow woman students.
I wrote this little profile to mark the 100th anniversary of her thesis:
September 24, 2025 at 9:14 AM
Cecilia Payne-Gaposchkin ✨ figured out what stars are made of ✨ when she was just 25. 🔭🧪
Her PhD thesis basically established the Harvard astro department — at a time when Harvard didn't officially allow woman students.
I wrote this little profile to mark the 100th anniversary of her thesis:
Her PhD thesis basically established the Harvard astro department — at a time when Harvard didn't officially allow woman students.
I wrote this little profile to mark the 100th anniversary of her thesis:
Three galaxies, aurora, mountains and clouds
A timelapse from a recent trip to Glenorchy, NZ - beautiful dark skies and plenty to look at, with clouds bubbling off the Humboldt Range, broken enough to see the southern lights below the Milky Way and Magellanic Clouds. EOS6Dii, 228 frames, 20s each
A timelapse from a recent trip to Glenorchy, NZ - beautiful dark skies and plenty to look at, with clouds bubbling off the Humboldt Range, broken enough to see the southern lights below the Milky Way and Magellanic Clouds. EOS6Dii, 228 frames, 20s each
September 24, 2025 at 11:37 PM
Three galaxies, aurora, mountains and clouds
A timelapse from a recent trip to Glenorchy, NZ - beautiful dark skies and plenty to look at, with clouds bubbling off the Humboldt Range, broken enough to see the southern lights below the Milky Way and Magellanic Clouds. EOS6Dii, 228 frames, 20s each
A timelapse from a recent trip to Glenorchy, NZ - beautiful dark skies and plenty to look at, with clouds bubbling off the Humboldt Range, broken enough to see the southern lights below the Milky Way and Magellanic Clouds. EOS6Dii, 228 frames, 20s each
A great summary of the start of the #wncl cricket season by @crystallised-cricket.com . Who will be the breakout stars of 2025-26? I'm looking forward to finding out!
WNCL PREVIEW: A Great Season for New Stars to Shine
by Helen Maynard-Casely @crystallised-cricket.com
crickether.com/2025/09/24/w...
by Helen Maynard-Casely @crystallised-cricket.com
crickether.com/2025/09/24/w...
WNCL PREVIEW: A Great Season for New Stars to Shine
by Helen Maynard-Casely A timelapse of the milky way making its way across the sky of the Southern hemisphere. One thing you will notice is that in the cacophony of stars, those celestial bodies yo…
crickether.com
September 24, 2025 at 11:09 PM
A great summary of the start of the #wncl cricket season by @crystallised-cricket.com . Who will be the breakout stars of 2025-26? I'm looking forward to finding out!
Two comets and Mars, 21st Sept
C/2025 R2 (SWAN) is keeping pace with Mars, and fainter C/2025 K1 (ATLAS) is descending towards the Sun. Processing was interesting, correcting for three moving objects against the twilight starfield. Tonight, the Moon joins the party!
EOS 6Dii, 35x1min, 300mm @ f/5.
C/2025 R2 (SWAN) is keeping pace with Mars, and fainter C/2025 K1 (ATLAS) is descending towards the Sun. Processing was interesting, correcting for three moving objects against the twilight starfield. Tonight, the Moon joins the party!
EOS 6Dii, 35x1min, 300mm @ f/5.
September 24, 2025 at 5:12 AM
Two comets and Mars, 21st Sept
C/2025 R2 (SWAN) is keeping pace with Mars, and fainter C/2025 K1 (ATLAS) is descending towards the Sun. Processing was interesting, correcting for three moving objects against the twilight starfield. Tonight, the Moon joins the party!
EOS 6Dii, 35x1min, 300mm @ f/5.
C/2025 R2 (SWAN) is keeping pace with Mars, and fainter C/2025 K1 (ATLAS) is descending towards the Sun. Processing was interesting, correcting for three moving objects against the twilight starfield. Tonight, the Moon joins the party!
EOS 6Dii, 35x1min, 300mm @ f/5.
Reposted by Andy Casely
In a UN speech today, President Trump said that "all of these [climate] predictions were wrong".
Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!
Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!
September 23, 2025 at 5:01 PM
In a UN speech today, President Trump said that "all of these [climate] predictions were wrong".
Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!
Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!
A Galactic frame of reference
What's your point of view? Does the Milky Way set, or does the Earth just get in the way? Been wanting to do this one for a while! ~6hrs, 30s per frame, EOS6Dii, Star Adventurer, Sigma 14-24mm. Processed in PixInsight & PS. #astrophotography #timelapse
What's your point of view? Does the Milky Way set, or does the Earth just get in the way? Been wanting to do this one for a while! ~6hrs, 30s per frame, EOS6Dii, Star Adventurer, Sigma 14-24mm. Processed in PixInsight & PS. #astrophotography #timelapse
September 13, 2025 at 5:16 AM
A Galactic frame of reference
What's your point of view? Does the Milky Way set, or does the Earth just get in the way? Been wanting to do this one for a while! ~6hrs, 30s per frame, EOS6Dii, Star Adventurer, Sigma 14-24mm. Processed in PixInsight & PS. #astrophotography #timelapse
What's your point of view? Does the Milky Way set, or does the Earth just get in the way? Been wanting to do this one for a while! ~6hrs, 30s per frame, EOS6Dii, Star Adventurer, Sigma 14-24mm. Processed in PixInsight & PS. #astrophotography #timelapse
Waxing Moon, 3rd Sept
I was playing with camera focus and focal length points on the C14 - 585MM + focal reducer = 7 panel whole Moon mosaic, The full-size processed image is 90 megapixels. Hello, nearest neighbour! Full res view here: photos.app.goo.gl/J5pR2DJYiwrq...
I was playing with camera focus and focal length points on the C14 - 585MM + focal reducer = 7 panel whole Moon mosaic, The full-size processed image is 90 megapixels. Hello, nearest neighbour! Full res view here: photos.app.goo.gl/J5pR2DJYiwrq...
September 10, 2025 at 9:02 AM
Waxing Moon, 3rd Sept
I was playing with camera focus and focal length points on the C14 - 585MM + focal reducer = 7 panel whole Moon mosaic, The full-size processed image is 90 megapixels. Hello, nearest neighbour! Full res view here: photos.app.goo.gl/J5pR2DJYiwrq...
I was playing with camera focus and focal length points on the C14 - 585MM + focal reducer = 7 panel whole Moon mosaic, The full-size processed image is 90 megapixels. Hello, nearest neighbour! Full res view here: photos.app.goo.gl/J5pR2DJYiwrq...
A dusty MIlky Way snap from a short break at Turon Gates, NSW. 29x90s, EOS 6Dii @24mm, Star Adventurer, good skies. Antares region is below centre. #astronomy #astrophotography
August 30, 2025 at 2:36 PM
A dusty MIlky Way snap from a short break at Turon Gates, NSW. 29x90s, EOS 6Dii @24mm, Star Adventurer, good skies. Antares region is below centre. #astronomy #astrophotography
Reposted by Andy Casely
Peter Rosén has created another great animation of #Jupiter's storms during the 2024/25 apparition, made from thousands of amateur observations and projected in a variety of different ways. Incredible amount of work must have gone into this #planetsci [Credit: P. Rosén]
youtu.be/x1W_Ux_jgaE?...
youtu.be/x1W_Ux_jgaE?...
2 Huge Storms have erupted on Jupiter
YouTube video by Peter R
youtu.be
June 24, 2025 at 4:05 PM
Peter Rosén has created another great animation of #Jupiter's storms during the 2024/25 apparition, made from thousands of amateur observations and projected in a variety of different ways. Incredible amount of work must have gone into this #planetsci [Credit: P. Rosén]
youtu.be/x1W_Ux_jgaE?...
youtu.be/x1W_Ux_jgaE?...
You have been kidnapped and a character from the last tv show you watched is trying to rescue you. Who is coming to save you?
Chances of survival... slim
Chances of survival... slim
June 12, 2025 at 5:29 AM
You have been kidnapped and a character from the last tv show you watched is trying to rescue you. Who is coming to save you?
Chances of survival... slim
Chances of survival... slim
Reposted by Andy Casely
“When the system forces you to code with a hallucinating clown, eventually you stop resisting. You let him type. You let him be "productive." You check out. You surrender your brain to the noise and just float.” deplet.ing/the-copilot-...
The Copilot Delusion
Disclaimer: This post was written May 2025, and the arguments apply to AI code capabilities at this time. The arguments around lack of competence are certainly likely to become less prevalent-while th...
deplet.ing
May 26, 2025 at 4:02 PM
“When the system forces you to code with a hallucinating clown, eventually you stop resisting. You let him type. You let him be "productive." You check out. You surrender your brain to the noise and just float.” deplet.ing/the-copilot-...
Reposted by Andy Casely
If your business model doesn’t work without breaking the law, then you’re not in business.
You’re in organized crime.
You’re in organized crime.
Nick Clegg says asking artists for use permission would ‘kill’ the AI industry
Nick Clegg says asking artists for use permission would ‘kill’ the AI industry
Paul McCartne, Elton John and others signed an open letter.
buff.ly
May 26, 2025 at 9:09 PM
If your business model doesn’t work without breaking the law, then you’re not in business.
You’re in organized crime.
You’re in organized crime.
Dust storm this morning, everything a bit hazy. Our periodic reminder there's a lot of desert away out west!
May 26, 2025 at 9:44 PM
Dust storm this morning, everything a bit hazy. Our periodic reminder there's a lot of desert away out west!
Sunrise on Saturn's rings
3 images 3rd-8th May (UT) - rings reappearing through Saturn's equinox on the 6th. First image shows the Sun/Earth-facing outer edge only, likely basically the F ring! (brightest equinox ring in Cassini 2009 data) Last image has south face of the rings illuminated again.
3 images 3rd-8th May (UT) - rings reappearing through Saturn's equinox on the 6th. First image shows the Sun/Earth-facing outer edge only, likely basically the F ring! (brightest equinox ring in Cassini 2009 data) Last image has south face of the rings illuminated again.
May 9, 2025 at 5:05 AM
Sunrise on Saturn's rings
3 images 3rd-8th May (UT) - rings reappearing through Saturn's equinox on the 6th. First image shows the Sun/Earth-facing outer edge only, likely basically the F ring! (brightest equinox ring in Cassini 2009 data) Last image has south face of the rings illuminated again.
3 images 3rd-8th May (UT) - rings reappearing through Saturn's equinox on the 6th. First image shows the Sun/Earth-facing outer edge only, likely basically the F ring! (brightest equinox ring in Cassini 2009 data) Last image has south face of the rings illuminated again.
Reposted by Andy Casely
If you like then you better put a ring on it! 🪐
@deep-twilight.bsky.social got a really nice pic of #Saturn during the time when it’s ring system is pretty much edge on to our perspective. And a couple of Moons!
Really like the colour of the equatorial and higher latitude belts.
@deep-twilight.bsky.social got a really nice pic of #Saturn during the time when it’s ring system is pretty much edge on to our perspective. And a couple of Moons!
Really like the colour of the equatorial and higher latitude belts.
May 7, 2025 at 1:01 AM
If you like then you better put a ring on it! 🪐
@deep-twilight.bsky.social got a really nice pic of #Saturn during the time when it’s ring system is pretty much edge on to our perspective. And a couple of Moons!
Really like the colour of the equatorial and higher latitude belts.
@deep-twilight.bsky.social got a really nice pic of #Saturn during the time when it’s ring system is pretty much edge on to our perspective. And a couple of Moons!
Really like the colour of the equatorial and higher latitude belts.
Hidden rings, 3rd May
You can see the rings in a longer-exposed, very heavily-stretched view! The ghostly rings are so faint just now that they are far outshone by 13.5mag Mimas (the fainter of the pair of moons on the left ansa). C14, ASI585MM, 6mins IR642nm. Sunrise on the rings is tomorrow...
You can see the rings in a longer-exposed, very heavily-stretched view! The ghostly rings are so faint just now that they are far outshone by 13.5mag Mimas (the fainter of the pair of moons on the left ansa). C14, ASI585MM, 6mins IR642nm. Sunrise on the rings is tomorrow...
May 5, 2025 at 12:01 PM
Hidden rings, 3rd May
You can see the rings in a longer-exposed, very heavily-stretched view! The ghostly rings are so faint just now that they are far outshone by 13.5mag Mimas (the fainter of the pair of moons on the left ansa). C14, ASI585MM, 6mins IR642nm. Sunrise on the rings is tomorrow...
You can see the rings in a longer-exposed, very heavily-stretched view! The ghostly rings are so faint just now that they are far outshone by 13.5mag Mimas (the fainter of the pair of moons on the left ansa). C14, ASI585MM, 6mins IR642nm. Sunrise on the rings is tomorrow...
Saturn, five moons, no rings
What a strange planet! Tomorrow is Saturn's equinox, a rare good look without its famous ring system, far too faint to see in a normally-exposed image, silhouetted against Saturn. Dione, Rhea, Mimas, Tethys and Enceladus too. C14, ASI585MM, 15mins, 3rd May 19:54UT.
What a strange planet! Tomorrow is Saturn's equinox, a rare good look without its famous ring system, far too faint to see in a normally-exposed image, silhouetted against Saturn. Dione, Rhea, Mimas, Tethys and Enceladus too. C14, ASI585MM, 15mins, 3rd May 19:54UT.
May 5, 2025 at 11:57 AM
Saturn, five moons, no rings
What a strange planet! Tomorrow is Saturn's equinox, a rare good look without its famous ring system, far too faint to see in a normally-exposed image, silhouetted against Saturn. Dione, Rhea, Mimas, Tethys and Enceladus too. C14, ASI585MM, 15mins, 3rd May 19:54UT.
What a strange planet! Tomorrow is Saturn's equinox, a rare good look without its famous ring system, far too faint to see in a normally-exposed image, silhouetted against Saturn. Dione, Rhea, Mimas, Tethys and Enceladus too. C14, ASI585MM, 15mins, 3rd May 19:54UT.
Saturn's hidden rings, 2nd May
A snap of the dark side of Saturn's rings, only four days before Saturn's equinox. The silhouette of darkened rings cuts across the planet, and the full extent of the very faint rings themselves are in an overexposed and strongly stretched version. #astrophotography
A snap of the dark side of Saturn's rings, only four days before Saturn's equinox. The silhouette of darkened rings cuts across the planet, and the full extent of the very faint rings themselves are in an overexposed and strongly stretched version. #astrophotography
May 3, 2025 at 9:12 AM
Saturn's hidden rings, 2nd May
A snap of the dark side of Saturn's rings, only four days before Saturn's equinox. The silhouette of darkened rings cuts across the planet, and the full extent of the very faint rings themselves are in an overexposed and strongly stretched version. #astrophotography
A snap of the dark side of Saturn's rings, only four days before Saturn's equinox. The silhouette of darkened rings cuts across the planet, and the full extent of the very faint rings themselves are in an overexposed and strongly stretched version. #astrophotography
Thanks @astrobob67.bsky.social for using my recent dark-side Saturn imsges in his latest column for S&T! I had another imaging attempt this morning, and they were even less visible, also not visible in the eyepiece in fairly bright twilight. skyandtelescope.org/astronomy-bl...
See the Lyrid Meteor Shower the Night of April 21–22
The annual Lyrid meteor shower should put on a great show this year. Enjoy it with dashes of Venus and the "dark side" of Saturn's rings.
skyandtelescope.org
April 18, 2025 at 5:25 AM
Thanks @astrobob67.bsky.social for using my recent dark-side Saturn imsges in his latest column for S&T! I had another imaging attempt this morning, and they were even less visible, also not visible in the eyepiece in fairly bright twilight. skyandtelescope.org/astronomy-bl...
Reposted by Andy Casely
screw it, let's give everyone a cluster!
inspired by @aussiastronomer.bsky.social's exoplanet handouts, every reply to this post will get a Milky Way star cluster + associated cluster fact.
I might struggle to keep up if this post gets >100 replies but I'll try!!
inspired by @aussiastronomer.bsky.social's exoplanet handouts, every reply to this post will get a Milky Way star cluster + associated cluster fact.
I might struggle to keep up if this post gets >100 replies but I'll try!!
my favourite part of my job is when someone asks me what a good star cluster to work on for their next paper would be, and I get to send them a little list of all the nice little clusters that would be nice to work on given their constraints ✨
April 14, 2025 at 8:50 AM
screw it, let's give everyone a cluster!
inspired by @aussiastronomer.bsky.social's exoplanet handouts, every reply to this post will get a Milky Way star cluster + associated cluster fact.
I might struggle to keep up if this post gets >100 replies but I'll try!!
inspired by @aussiastronomer.bsky.social's exoplanet handouts, every reply to this post will get a Milky Way star cluster + associated cluster fact.
I might struggle to keep up if this post gets >100 replies but I'll try!!
A cloudy crescent
Venus on the morning of 13th April, lovely big thin crescent with the long horns from this hellish cloudy planet's atmosphere. Taken just after sunrise in good seeing. Celestron C14, QHY5III200M, 10mins data.
Venus on the morning of 13th April, lovely big thin crescent with the long horns from this hellish cloudy planet's atmosphere. Taken just after sunrise in good seeing. Celestron C14, QHY5III200M, 10mins data.
April 14, 2025 at 11:58 AM
A cloudy crescent
Venus on the morning of 13th April, lovely big thin crescent with the long horns from this hellish cloudy planet's atmosphere. Taken just after sunrise in good seeing. Celestron C14, QHY5III200M, 10mins data.
Venus on the morning of 13th April, lovely big thin crescent with the long horns from this hellish cloudy planet's atmosphere. Taken just after sunrise in good seeing. Celestron C14, QHY5III200M, 10mins data.