Caption: A diagram from 10th century CE Greek copy of Aristarchus of Samos' (c.310--c.230 BCE) treatise On the Sizes and Distances of the Sun and Moon (3rd Century BCE).
But the ancient Greek astronomers never got any other astronomical distances accurately.
Aristarchus and Seleucus of Seleucia (fl. 150 BCE) were the only two people before Nicolaus Copernicus (1473--1543) known to have advocated heliocentrism---but almost nothing is known about their version of heliocentrism---we just have bare statements that they advocated it.
Ironically, On the Sizes and Distances of the Sun and Moon (3rd Century BCE) assumes a geocentric solar system model.
Credit/Permission: Aristarchus of Samos
3rd century BCE
(uploaded to Wikimedia Commons
Image link: Wikimedia Commons: File:Aristarchus working.jpg.
Local file: local link: aristarchos_manuscript.html.
File: Ancient Astronomy file: aristarchos_manuscript.html.