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"Astronomy Ch.4 (The origin of modern astronomy)"

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Words
center of mass
circular velocity
closed orbit
deferent
eccentricity, e
ellipse
epicycle
equant
escape velocity
galilean moons
geocentric universe
geosynchronous satellite
heliocentric universe
hypothesis
inverse square relation
mass
natural law
neap tide
open orbit
paradigm
parallax
retrograde motion
semimajor axis,a
spring tide
theory
uniform circular motion