Ah, but Galileo told people about it 😉
just one Lunar distance away
Away from us and not from the Moon, I hope!
That’s some peanut!
Focus the telescope by eating the doughnuts
Tej, you should write an astronomy travelogue book with that as the title!
Wow! Amazing, Tej!!
Didn’t see it at all, but TBH I haven’t rushed to watch it on iPlayer. I always feel a bit as though Dara O’Briain is trying to be Brian Cox and Brian Cox is trying to be Dara O’Briain. And only one of them is coming close to succeeding.
The astrophotography video we show at the beginning of our lectures. You can send it to Flamsteed@rmg.co.uk – file size shouldn’t be a problem. Thanks!
here is the result.
Cool! Care to send a copy to me for the video?
Frederick William Herschel discovered a new planet, Uranus
Thereby doubling the size of the solar system, from 9.5AU to 19AU. Not a bad day’s work!
You got image 3 and 2 out of image 1??? Wow!!!
Rupert, could I ask you to send those to me please and I’ll figure out a way of incorporating them into the video in an effective way? Thanks! Wow.
Well, there’s a coincidence!! Two of the contestants on tonight’s Mastermind had as their specialist subjects (i) Johannes Kepler and (ii) Isaac Newton!!
Thanks for that, Mike. I eventually remembered that there’s a ‘show satellites’ option on Stellarium, too, though the dataset on the mobile app seems more complete than the desktop app which doesn’t seem to have this particular piece of space hardware.
how did Kepler know Mars orbital period in the first place
A bit of brilliance on Copernicus’s part, I believe.
Imagine that a planet is at opposition – so it culminates/appears due south at midnight. Then wait for the next time it’s at opposition. Suppose that’s 456 days (1.25 years) later. So in the time it has taken the Earth to travel one-and-a-quarter orbits, the other planet has done only a quarter of an orbit (you know it’s a quarter of an orbit because Earth and the other planet are in alignment with the Sun again). Earth has caught up with and aligned with that other planet.
So if a quarter of that other planet’s orbital period is 1.25 years, then its actual orbital period is 5 years.
Here’s the figures for Mars:
Now go back to that figure 1.82, the ratio of Mars’s orbital period (T) to the Earth’s. Square that number and take the cube root to get 1.52 – Mars’s orbital radius (R) in AU!
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