juamei
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Re: Who's going to be there this weekend?
Apr 22, 2011, 17:57
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Horsedrawn wrote: Come on lets have the original theory now. I showed you mine. Show me yours. Is it the one about using the aperture to calculate the true size of the earth and the distance from the sun?
I would love to see that reasoning!
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Sanctuary
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Re: Who's going to be there this weekend?
Apr 22, 2011, 18:15
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Horsedrawn wrote: Come on lets have the original theory now. I showed you mine. Show me yours. Is it the one about using the aperture to calculate the true size of the earth and the distance from the sun?
Are we into fantasy territory now?
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nigelswift
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Re: Who's going to be there this weekend?
Apr 22, 2011, 18:29
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juamei wrote: I would love to see that reasoning!
Eratosthenes did exactly that, so why not a Cornishman?
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Mr Hamhead
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Re: Who's going to be there this weekend?
Apr 22, 2011, 19:26
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I ain't promising nothing...but if I can get up it won't be till about 6pm any of the next three evenings as I am working till 5.15 each day.
Mr H
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juamei
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Re: Who's going to be there this weekend?
Apr 22, 2011, 20:15
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Like I said, I would love to see that reasoning! No sarcasm intended. :)
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nigelswift
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Edited Apr 23, 2011, 04:12
Re: Who's going to be there this weekend?
Apr 23, 2011, 02:50
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Now I come to think of it, you need your vertical aperture not to be in Cornwall but the tropics to do the calculation. (In his case it was in Syene, where he knew the sun shone down a well at midday at Solstice). http://www.juliantrubin.com/bigten/eratosthenes.html
So the short answer is no, a vertical aperture in Cornwall wouldn't help. ;) Sorry!
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Sanctuary
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Re: Who's going to be there this weekend?
Apr 23, 2011, 06:00
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nigelswift wrote: Now I come to think of it, you need your vertical aperture not to be in Cornwall but the tropics to do the calculation. (In his case it was in Syene, where he knew the sun shone down a well at midday at Solstice). http://www.juliantrubin.com/bigten/eratosthenes.html
So the short answer is no, a vertical aperture in Cornwall wouldn't help. ;) Sorry!
Jethro will be disappointed! :D
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juamei
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Re: Who's going to be there this weekend?
Apr 23, 2011, 06:26
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You also need it to be completely vertical, which would be practically impossible to verify on such a small scale. Very impressive how close he got though.
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nigelswift
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Re: Who's going to be there this weekend?
Apr 23, 2011, 07:01
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Well (and this is pointless as we're not in the tropics) you'd use a bit of wood with a half inch hole, and a plumb line attached to a twig going across the hole, and if the sun lit up the plumb bob.....
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StoneGloves
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Re: Who's going to be there this weekend?
Apr 23, 2011, 07:33
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I've just sold a Roman plumb bob, via eBay, to a buyer in the states. I've another one to list. They're both small ones and nobody nowadays would have a clue how to start to use them.
Hypotheses seem to come from nowhere but actually have been stewing away unconsciously for a considerable time. If there are any measurements posted here it will be a first time and, subsequently, a world record!
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