Or is their take that the entire universe revolves using the earth's orbit as a cam? So the entirety of Creation apart from the earth is under constant and variable 3-vector acceleration?Sure. This is a perfectly valid coördinate system to use. The rest of the universe is kept in place by inertial pseudoforces or something, I guess. It's just a really really inconvenient coördinate system for doing anything that isn't connected to the Earth's surface, and even for some things that are. But then, the reverse is also true: trying to do, say, architecture or GIS in a solar-barycentric or galactic-barycentric reference frame would be absurdly inconvenient also. Physics really doesn't care what frame we arbitrarily choose to call motionless. We choose one that makes things easier to think about. Frequently it's not even an inertial frame!
A famous example of different pictures of reality is the model introduced around A.D. 150 by Ptolemy (ca. 85–ca. 165) to describe the motion of the celestial bodies. Ptolemy published his work in a treatise explaining reasons for thinking that the earth is spherical, motionless, positioned at the center of the universe, and negligibly small in comparison to the distance of the heavens.-Stephen Fucking Hawking
This model seemed natural because we don't feel the earth under our feet moving (except in earthquakes or moments of passion). Ptolemy's model of the cosmos was adopted by the Catholic Church and held as official doctrine for fourteen hundred years. It was not until 1543 that an alternative model was put forward by Copernicus. So which is real? Although it is not uncommon for people to say Copernicus proved Ptolemy wrong, that is not true. As in the case of the goldfish, one can use either picture as a model of the universe.
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posted by blucevalo at 11:14 AM on September 17, 2010 [1 favorite]