"Ptolemy proved in the fifth book of his Syntaxis that, if the radius of the earth is taken as the unit, the greatest distance of the moon at the conjunctions is 64 10/60 of such units, the greatest distance of the sun 1210, the radius of the moon 17/60 33/602, the radius of the sun 5 30/60. Consequently, if the diameter of the moon is taken as the unit, the earth's diameter is 3 2/5 of such units, and the sun's diameter 18 4/5. That is to say, the diameter of the earth is 3 2/5 times the diameter of the moon, while the diameter of the sun is 18 4/5 times the diameter of the moon and 5 1/2 times the diameter of the earth. From these figures the ratios between the solid contents are manifest, since the cube on 1 is 1 unit, the cube on 3 2/5 is very nearly 39 1/4 of the same units, and the cube on 18 4/5 very nearly 6644 1/2, whence we infer that, if the solid magnitude of the moon is taken as a unit, that of the earth contains 39 1/4 and that of the sun 6644 1/2 of such units; therefore the solid magnitude of the sun is very nearly 170 times greater than that of the earth."
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Pappus (c. 320 AD)
https://en.wikiquote.org/wiki/Aristarchus_of_Samos
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Aristarchus of Samos
Aristarchus of Samos (c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who devised the first known model envisioning the Earth in motion, orbiting around the Sun, or "central fire," at the center of the universe. He was influenced by Philolaus, and argued, like Anaxagoras before him, that the stars were entities similar to the sun. His astronomical ideas were in large rejected in favor the prevailing geocentric models of Aristotle and Ptolemy, until De revolutionibus orbium
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