Thanks everyone for all your likes, follows comments and questions this week. Particularly on my history of Jupiter series! You are awesome!

While Andrew Ainslie Common was pioneering Jupiter photography, French artist-astronomer Étienne Léopold Trouvelot captured what he saw through Harvard’s 15-inch Merz refractor. Drawn Nov 1 1880 (9:30 PM); published 1881 in The Trouvelot Astronomical Drawings. #AstroHistory #Jupiter

The first surviving successful image of Jupiter was taken in 1879 by Andrew Ainslie Common in Ealing, London, using his 36-inch Newtonian reflector and the wet collodion process invented in 1851 by portrait photographer Frederick Scott Archer

I’m going to have an educated guess at the moon image: I think we’re looking at a half moon (white circle with terminator black line), exposed that the earthshine is showing on the right. The purple circle is the scope aperture. The bubbles artefacts of the development process. What do you think?

Fireworks at Clacton Pier last night. “Remember Remember the 5th November”. Where we remember that in 1605, Guy Fawkes tried to blow up the houses of parliament. He wanted to kill the King, Lords and MP’s, trigger an uprising and place a young Princess Elizabeth on the throne

My walk right now #MoonHour

Leaping on several hundred years, my next people are: Louis Daguerre: Creator of Daguerreotype technique and took the first photo of a human John Draper: Used Daguerre's technique, a daguerreotype plate and a 5-inch reflector telescope to capture the Moon—paving the way for astrophotography

Sunset just now #Sunset

Earth and its moon are framed in this image taken from the aft windows of the Space Shuttle Discovery in 1998. Discovery mission STS-95 was flying over the Atlantic Ocean when this image was taken. The STS-95 mission also marked the return of U.S. Senator John Glenn to space. Image credit: NASA

In 1668 Isaac Newton built the first reflecting telescope, inspired by his prism experiments on light and colour; he solved the chromatic blur in glass lenses. Using Cassini and Flamsteed’s observations of Jupiter’s moons (1687), he proved his law of universal gravitation held true. #AstroHistory

The #BeaverMoon — #Supermoon — over Orlando. I was happy I could capture this. I used my #Celestron NexStar 8SE #telescope and #Canon camera. (The photo of the moon over #Orlando is a composite and whatnot.) #astronomy #astrophotography #moon #FullMoon

That is an amazing capture! That is more detailed than what I got of Io earlier this year. And I love the facts you shared.

Earth and its moon are framed in this image taken from the aft windows of the Space Shuttle Discovery in 1998. Discovery mission STS-95 was flying over the Atlantic Ocean when this image was taken. The STS-95 mission also marked the return of U.S. Senator John Glenn to space. Image credit: NASA

In 1668 Isaac Newton built the first reflecting telescope, inspired by his prism experiments on light and colour; he solved the chromatic blur in glass lenses. Using Cassini and Flamsteed’s observations of Jupiter’s moons (1687), he proved his law of universal gravitation held true. #AstroHistory

Sunset this evening was stunning. One from the top road at Aylmerton & down to Sheringham sea front where the sea was just glowing pink 🥰 #CoastLife #Sunset @chrisdoward.bsky.social @chrispage90.bsky.social @christhomson.bsky.social @skycalpro.com @virtualastro.bsky.social

This JSWT image shows Jupiter's Ring. Also you can see Jupiter's Great Red Spot (GRS), Jupiter's large moon Europa (the diffraction spikes) on the left, and Europa's shadow (next to the GRS). The seemingly separated cloud layer on Jupiter's right limb are not yet well understood. #Astronomy #Jupiter

In 1676 Ole Rømer saw eclipses of Jupiter’s moon Io run late when Earth moved away from Jupiter and early when approaching. Earth’s orbital diameter was known from Kepler’s laws; from this he was the first to estimate the speed of light (at 220,000 km/s) and was accurate to 75% #AstroHistory

Sunset just now

My favourite region on the #moon, Mare Imbrum, with adjacent craters Sinus Iridum, Plato and Copernicus. In this moon phase, special tectonic features, so-called wrinkles are visible on the floor of Mare Imbrum, inter alia Dorsum Heim and Dorsum Zirkel Skymax102, ASI 220 Mini Mono 🔭 #astrophoto

This JSWT image shows Jupiter's Ring. Also you can see Jupiter's Great Red Spot (GRS), Jupiter's large moon Europa (the diffraction spikes) on the left, and Europa's shadow (next to the GRS). The seemingly separated cloud layer on Jupiter's right limb are not yet well understood. #Astronomy #Jupiter

If you like visualisations on how Romer calculated the speed of light, this software is a nice resource. A few steps to install and use, but it's all there. Thanks @finitemonkey.bsky.social for the tip!

In 1676 Ole Rømer saw eclipses of Jupiter’s moon Io run late when Earth moved away from Jupiter and early when approaching. Earth’s orbital diameter was known from Kepler’s laws; from this he was the first to estimate the speed of light (at 220,000 km/s) and was accurate to 75% #AstroHistory

Tomorrow I continue the history of Jupiter with how it was used to accurately measure the speed of light (250 years ago)! Sadly no drawings tomorrow, my next person's drawings, notes and equipment were all destroyed....

On June 3, 1965, Edward H. White II became the first American to step outside his spacecraft and let go, effectively setting himself adrift in the zero gravity of space. For 23 minutes he floated and maneuvered himself around the Gemini spacecraft while logging 6,500 miles during his orbital stroll.

In 1665, Giovanni Cassini was first to observe a “Permanent Spot” on Jupiter, though probably wasn't today’s Red Spot using 34-ft refractors at the Paris Observatory. He tracked it for years to measure Jupiter’s rotation. Cassini’s drawings survive in Paris Observatory archives. #AstroHistory

On June 3, 1965, Edward H. White II became the first American to step outside his spacecraft and let go, effectively setting himself adrift in the zero gravity of space. For 23 minutes he floated and maneuvered himself around the Gemini spacecraft while logging 6,500 miles during his orbital stroll.

In 1665, Giovanni Cassini was first to observe a “Permanent Spot” on Jupiter, though probably wasn't today’s Red Spot using 34-ft refractors at the Paris Observatory. He tracked it for years to measure Jupiter’s rotation. Cassini’s drawings survive in Paris Observatory archives. #AstroHistory

Rocket launch in less than two hours: Ariane 6 (Arianespace): Sentinel-1D Mission, Launching a radar satellite into a Sun-Synchronous Orbit to provide weather updates day and night ESA are live streaming - Remember that skycalpro.com lists all upcoming launches and links to live video if available!

Galileo's O and * drawing of Jupiter and it's moons aren't so impressive given the likes, but it's Monday so I'll forgive! I'm going to stick with Jupiter history for this week. Tomorrow is Cassini. He used Kepler optics 🔭 and his drawings of Jupiter were much better! Image credit: JPL/NASA/STScI

Thanks again for all the likes and retweets. My Voyager II and Isaac Roberts tweets seem popular, so I'm going to each day this week with a little history of Jupiter. Hopefully by the end of the week I'll have finished testing the next release of skycalpro.com (Jupiter GRS) #AstroHistory

This is Jupiter recorded by Voyager 1 in 1979. Note the difference in speed & direction of the zones of the atmosphere. This turbulence is erratic and makes it hard to predict when the red spot will appear over a period time. Named Blue Movie as it was built from blue filter images. #Astronomy

What would Galileo say, from his prison cell?

The Solid State Imaging (CCD) system aboard NASA's Galileo spacecraft obtained the Jupiter, Io and Ganymede images in June 1996, while the Europa images were obtained in September 1996. The portrait of Callisto is from the 1979 flyby of NASA's Voyager spacecraft. #Jupiter #Astronomy

Galileo made his own telescopes, and two originals survive at the Museo Galileo, Florence. One (1609) has a 37 mm lens stopped to 15 mm, 980 mm focal length, 21× mag; the other (1610) a 51 mm lens, 1330 mm focal length, 14×. His 1610 book Sidereus Nuncius is also preserved there. #Astronomy #Jupiter

In 1610, Galileo and Simon Marius first saw Jupiter’s moons. Galileo is credited with the discovery as he published first. The sketches below are from his book. Galileo tried to argue that Earth circles the Sun, but under threat of torture was forced to renounce the idea #AstroHistory #Jupiter

I wish Bluesky had an edit button. I can read my own post 20 times and still not see that I missed a word out. Been the same my whole life! I just don’t see it! I love passing on information, but writing isn’t my favourite way to do it!

It's not the best image you are going to see of Comet C/2025 A6 (Lemmon), but I managed to catch it with my DSLR. 30 images stacked. 5 seconds/ISO 800/ F/3.5. A quick set up with the intervalometer, just after sunset. I'm quite pleased to have caught it! #Astrophotography #Astronomy

The Solid State Imaging (CCD) system aboard NASA's Galileo spacecraft obtained the Jupiter, Io and Ganymede images in June 1996, while the Europa images were obtained in September 1996. The portrait of Callisto is from the 1979 flyby of NASA's Voyager spacecraft. #Jupiter #Astronomy

In 1610, Galileo and Simon Marius first saw Jupiter’s moons. Galileo is credited with the discovery as he published first. The sketches below are from his book. Galileo tried to argue that Earth circles the Sun, but under threat of torture was forced to renounce the idea #AstroHistory #Jupiter

Compilation of Moon photos from the last full moon until tonight 📸 Nikon Coolpix P1000 #moonhour #moonphotography #photography

OMG. Green. Stack is up! This is staging-not production/live. A couple more features to add and test, but those will be easy. This is cool, and will make skycalpro.com more reliable because it wont rely on me remembering to update GRS positions! Good for you, good me 😁

Thanks again for all the likes and retweets. My Voyager II and Isaac Roberts tweets seem popular, so I'm going to each day this week with a little history of Jupiter. Hopefully by the end of the week I'll have finished testing the next release of skycalpro.com (Jupiter GRS) #AstroHistory

This image was obtained by the Cassini spacecraft wide-angle camera in 2006. Approximately 1.4 million kilometers (900,000 miles) from Saturn. Image scale is 83 kilometers (51 miles) per pixel. Image credit: NASA/JPL/Space Science Institute #Astronomy

One last attempt to 'capture' Comet Lemmon this evening but it was too low and hidden behind trees where I live. Still, thanks C/2025 A6 (Lemmon) for defying the clouds throughout October. Here's the best 4 chronologically. See you in 1350 years! #astronomy #astrophotography #stormhour #photohour

I captured this somewhat grainy view of Comet Lemmon last night west of Oklahoma City. The moonlight was bright, so I hope to try again later this week! #astrophotography #comet #nikon

The moon tonight, through a Meade ETX-90EC. #astrophotography

Messier 27, often called the Dumbbell Nebula, is a planetary nebula about 1,360 light-years away in the constellation Vulpecula. This image maps light emitted by Sii, Hα, and Oiii gas. The shock-excited structures expanding at roughly 30 km/s. #astrophotography @kat-astro-bot.bsky.social

The 90% #waxing #gibbous #Moon through the clouds, 2025 11 02, 20:41:02 UTC at an altitude of 37° 45' and a distance of 361 696 km. Nikon D800 Skywatcher 200P f/5.9, 1/60s, ISO-6400, 1200 mm FL #astronomy #astrophotography #craters

Just spinning up the staging server. Been working on the Jupiter Great Red Spot drift rate automation and its now ready for the next stage of testing. Cool image of the GRS from Voyager. I'll tell you more about it next week #AstroMethods

This is Jupiter recorded by Voyager 1 in 1979. Note the difference in speed & direction of the zones of the atmosphere. This turbulence is erratic and makes it hard to predict when the red spot will appear over a period time. Named Blue Movie as it was built from blue filter images. #Astronomy