SkyCalPro | Kev
@skycalpro.com
🔭I loved CalSky🛰️the app to that tells you what you will see if you look up at the sky tonight. 🪐 I waited for someone to recreate it after it went offline but no-one did so I created it myself...💫
https://skycalpro.com
https://skycalpro.com
In 1892 E.E. Barnard discovered Jupiter's 5th moon, Amalthea, the last moon found by eye through a telescope. Over the next 80 years photos were B&W, and improved only a little over the period.
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
November 12, 2025 at 7:19 AM
In 1892 E.E. Barnard discovered Jupiter's 5th moon, Amalthea, the last moon found by eye through a telescope. Over the next 80 years photos were B&W, and improved only a little over the period.
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
Been a poor show with my photography recently. I didn't enter the last club PDI competition (I run them so that's bad form!). I hardly used my camera last year. But I did take some pics in London recently. My Open Colour PDI entries: 'Tulip Staircase' and 'Salmon & Lime'
November 11, 2025 at 8:23 PM
Been a poor show with my photography recently. I didn't enter the last club PDI competition (I run them so that's bad form!). I hardly used my camera last year. But I did take some pics in London recently. My Open Colour PDI entries: 'Tulip Staircase' and 'Salmon & Lime'
Educated guess again, but recon the lighter dots (circled blue) are moons, and the darker dots (circled green) are their shadows. I ran some calcs and found that there is a double occultation occuring around that time so it would make sense (to me anyway!) - what do you think?
November 11, 2025 at 7:39 PM
Educated guess again, but recon the lighter dots (circled blue) are moons, and the darker dots (circled green) are their shadows. I ran some calcs and found that there is a double occultation occuring around that time so it would make sense (to me anyway!) - what do you think?
After a lot of faffing this week, early this morning, I managed to stage the changes to the GRS calculation on SkyCalPro. That's a big step.
When i get time this week I'll mock it up in production and see if it goes up there too. Hopefully ready publicly in the next couple of days
#AstroMethods
When i get time this week I'll mock it up in production and see if it goes up there too. Hopefully ready publicly in the next couple of days
#AstroMethods
November 11, 2025 at 12:53 PM
After a lot of faffing this week, early this morning, I managed to stage the changes to the GRS calculation on SkyCalPro. That's a big step.
When i get time this week I'll mock it up in production and see if it goes up there too. Hopefully ready publicly in the next couple of days
#AstroMethods
When i get time this week I'll mock it up in production and see if it goes up there too. Hopefully ready publicly in the next couple of days
#AstroMethods
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
Drawn Nov 1 1880 (9:30 PM); published 1881 in The Trouvelot Astronomical Drawings. #AstroHistory #Jupiter
November 11, 2025 at 8:07 AM
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
Drawn Nov 1 1880 (9:30 PM); published 1881 in The Trouvelot Astronomical Drawings. #AstroHistory #Jupiter
UK amateur Andrew A. Common ordered a 36" mirror from George Calver & designed/built the mount himself in his Ealing backyard—one of the first big silver-on-glass reflectors. He sold it to Crossley who donated to Lick Observatory where it stands today
#AstroHistory
#AstroHistory
November 10, 2025 at 8:24 AM
UK amateur Andrew A. Common ordered a 36" mirror from George Calver & designed/built the mount himself in his Ealing backyard—one of the first big silver-on-glass reflectors. He sold it to Crossley who donated to Lick Observatory where it stands today
#AstroHistory
#AstroHistory
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
November 10, 2025 at 8:24 AM
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?
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?
November 9, 2025 at 1:48 PM
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?
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
November 9, 2025 at 7:54 AM
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
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
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
November 8, 2025 at 5:54 PM
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
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
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
Image credit: NASA
November 7, 2025 at 7:27 AM
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
Image credit: NASA
Newton’s tiny 1668 reflector, only six inches long, is preserved in the Royal Society’s collections in London. His annotated copy of the Principia (1687) is held in Cambridge University Library’s Special Collections. #AstroHistory #IsaacNewton
November 7, 2025 at 7:19 AM
Newton’s tiny 1668 reflector, only six inches long, is preserved in the Royal Society’s collections in London. His annotated copy of the Principia (1687) is held in Cambridge University Library’s Special Collections. #AstroHistory #IsaacNewton
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
November 7, 2025 at 7:19 AM
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
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
#Astronomy #Jupiter
November 6, 2025 at 7:29 AM
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
#Astronomy #Jupiter
Most of Rømer’s work was lost in the Copenhagen Fire of 1728, including his telescopes and notes. Rømer invented the meridian circle, the altazimuth, and the transit instrument. He also invented the first street lights in Copenhagen! #AstroHistory #Copenhagen
November 6, 2025 at 6:51 AM
Most of Rømer’s work was lost in the Copenhagen Fire of 1728, including his telescopes and notes. Rømer invented the meridian circle, the altazimuth, and the transit instrument. He also invented the first street lights in Copenhagen! #AstroHistory #Copenhagen
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
November 6, 2025 at 6:51 AM
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....
November 5, 2025 at 7:11 PM
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....
Exactly! The engineer’s had a lot of problems to solve when planning this mission…
November 5, 2025 at 12:24 PM
Exactly! The engineer’s had a lot of problems to solve when planning this mission…
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.
November 5, 2025 at 6:55 AM
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.
Cassini’s long-focus refractors, built by Campani, were mounted at the Paris Observatory and on the “Marly Tower.” He used them to study Jupiter’s moons and their eclipses—data later key to Römer’s discovery later that the speed of light is not infinite as was the view at the time #Astronomy
November 5, 2025 at 6:47 AM
Cassini’s long-focus refractors, built by Campani, were mounted at the Paris Observatory and on the “Marly Tower.” He used them to study Jupiter’s moons and their eclipses—data later key to Römer’s discovery later that the speed of light is not infinite as was the view at the time #Astronomy