….!

Oh well, it's only takes years of trial and error studying various techniques and inhuman quantities of patience. Here's 2000 hours compressed to 30 seconds. 24 inch (62 cm) diameter f/3.4 paraboloid primary mirror.

To be fair, I could probably manage 30 seconds....!

2000 hours! Blimey, that IS a lot of patience!

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?

I created skycalpro.com to help you find out what is happening in the night sky over your home tonight. It’s free - check it out :) This week I am working on Jupiter Red Spot calculations..

I created skycalpro.com to help you find out what is happening in the night sky over your home tonight. It’s free - check it out :) This week I am working on Jupiter Red Spot calculations...

My post today shows an artists impression of how Jupiter looked around the same time, making an interesting comparison

I had the same thought. Never attempted it, but I hear it's a looong process.

Isn't it!

Indeed - I'm always impressed by what could be achieved back then - and now!

The consensus from what I've read is that the spot was a lot larger and is shrinking and could disappear in the next 20 years. According to 'A Popular History of Astronomy': 'the direct image in which imprinted itself in a fraction of a second' so possibly not due to long exposure smear.

Yes, I’ve looked at that a couple of times today and wondered if they weren’t the same scope. The image appears a lot and I think you could be right.

Nice!
Thanks for adding😁👍

I recon he couldn’t see the dark side whilst exposing which is why the moon falls slightly outside the view. I think it’s a bit over exposed and he might not have anticipated getting earth shine. If so then he would have been super thrilled to have caught this. I’m just guessing of course!

Yes- well spotted. I read somewhere that it could be gone within 20 years… The original spot found by Cassini in 1665 was likely not same spot seen today. The one in this 1879 image is the same storm as today but it’s shrinking noticeably. So spots seem to come and go, albeit slowly.

🤣

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