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Unearthed Arcana: Travelers of the Multiverse
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<blockquote data-quote="Demetrios1453" data-source="post: 8434572" data-attributes="member: 6801060"><p>I think you're meaning the stellar parallax, not stellar proper motion. Proper motion was already suspected in ancient times, and was proven as time went on and certain stars such as Arcturus had obviously shifted from their position over the centuries.</p><p></p><p>Stellar parallax was the real bump in the road for heliocentric models. If the Earth moved around the Sun, the stars would be seen to shift on a yearly basis as the Earth moved in its orbit, but no such movement was ever observed in ancient, medieval, and early modern times, simply because the stars were so much farther than anyone suspected. The lack of an observed stellar parallax was the ultimate and conclusive argument against heliocentrism, and it was the rock upon which Gallileo's defense foundered. It wasn't until 1837 that telescopes were powerful enough to detect stellar parallax and the heliocentric model was definitively proven (although by that point few believed otherwise).</p></blockquote><p></p>
[QUOTE="Demetrios1453, post: 8434572, member: 6801060"] I think you're meaning the stellar parallax, not stellar proper motion. Proper motion was already suspected in ancient times, and was proven as time went on and certain stars such as Arcturus had obviously shifted from their position over the centuries. Stellar parallax was the real bump in the road for heliocentric models. If the Earth moved around the Sun, the stars would be seen to shift on a yearly basis as the Earth moved in its orbit, but no such movement was ever observed in ancient, medieval, and early modern times, simply because the stars were so much farther than anyone suspected. The lack of an observed stellar parallax was the ultimate and conclusive argument against heliocentrism, and it was the rock upon which Gallileo's defense foundered. It wasn't until 1837 that telescopes were powerful enough to detect stellar parallax and the heliocentric model was definitively proven (although by that point few believed otherwise). [/QUOTE]
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