They did not have that. Here is a summary table. All the Greek estimates were not better than guesses. Wendelin (1635, Earth/Moon baseline triangulation) and Horrocks (1639, size of Venus during transit) were the first estimates that were somewhat reasonable - both got the distance wrong by a factor 2.Once they had the Sun's distance
Nice picture but it is not 'as seen'. The clouds would have moved much more than Mercury during the time for the multiple exposures.Here is mercury, a good example of a "star" wandering.
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Very good point, thanks.Nice picture but it is not 'as seen'. The clouds would have moved much more than Mercury during the time for the multiple exposures.
I am still having to come to terms with the difference between the astrophotographs that get published and what you actually see. Lots of scope for artistic expression - even if it's just the false colour that's used to accentuate the features of astronomical objects.
Have you read Newton? Copernicus? Here is a book written actually for entertainment purposes, but is educational as well http://www.gutenberg.org/files/52709/52709-h/52709-h.htm#Page_466 Ive posted a link starting with the chapter on Astronomy. Title of book is Popular Scientific Recreations, by Gaston Tissandier, I didn't check the pub. date but it is over a century old at least. Here is another GREAT book: Copernicus, Brahe, all of the greats are in here http://www.gutenberg.org/files/2298/2298-h/2298-h.htm it gives pretty good descriptions of the hows whys wheres and whatnots. You have a curious and inquiring nature, which is a sign of INTELLIGENCE. It asks questions as to how and why. This tells us you are not a dolt and simply toss up your hands and don't care. What concerns me personally is the fact you simply tossed the question out there, but haven't researched for the answers on your own. The answers are not hidden in some obscure and lofty database accessible only by using a special key, or permissions or need a credit card to access via a paywall. The BEST books are free, as the newer ones are so conciliatory and like to dangle the answers using obscure and confusing terminology, just the way Soros likes it, only the elites are supposed to know these things, it seems (don't knock me, my uncle wrote the stuff for SCANs, so I know more about it than your regular person might)Let's be honest...Why were planets visible to the ancient people and not to us humans any longer? Is it because the planets distanced? How can some planets distance themselves while others don't? It's said that light pollution has affected the visibility of planets in the sky, whereas there still reports of people seeing at least one planet in the sky. So how come ancient astrology was on right before the telescopes?