Copernicus on Gravity
I myself consider that gravity is merely a certain natural inclination with which parts are imbued by the architect of all things for gathering themselves together into a unity and completeness by assembling into the form of a globe. It is easy to believe that the Sun, Moon and other luminaries among the wandering stars have this tendency also, so that by its agency they retain the rounded shape in which they reveal themselves, but nevertheless go round their orbits in various ways. If then the Earth also performs other motions, as for example the one about the centre, they must necessarily be like those which are similarly apparent in many external bodies in which we find an annual orbit.
Notes:
He correctly surmises that the force pulls heavenly objects into spheres.
Folksonomies: history science astronomy gravity
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Sun (0.771817): dbpedia | freebase | opencyc
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Earth (0.683228): dbpedia | freebase
Orbit (0.623269): dbpedia | freebase
Dwarf planet (0.608460): dbpedia | freebase | yago
Ecliptic (0.586965): dbpedia | freebase | opencyc
On The Revolutions of Heavenly Spheres