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Astronomy and Cosmology
Astronomy and Astrophysics
Orientation of the Earth, Sun and Solar System in the Milky Way
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[QUOTE="Dahook4444, post: 5861711"] Excellent diagram! Still not clear how we are able to distinguish the Sun's forward motion around the Galactic center from the forward motion of the "Orion Arm"? If we assume one rotation of Sun around Galactic center at 26K light year radius we are looking at a distance of 164K light years over say 226 million years. So one degree of forward motion would take approx. half a million years. Now math is not my strong point so happy to be "slapped down". Also the "declination" cycle of Sun above and below the Galactic plane has been estimated at 70 millions years to complete.and this seems to be the most Influential short-term cycle, so interesting to speculate on its cause. Within this cycle we get the Precession cycle of 26k years, as seen from the Earth which suggests constellations are moving with the Sun. Point I'm making is the time scales and distances are so vast how do we separate out observed fact from assumption. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Orientation of the Earth, Sun and Solar System in the Milky Way
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