[In about 270 B.C., Aristarchus of Samos proposed the helicentric model of solar system, which correctly placed the Sun at the center with Earth and the other planets revolving around it. He reashed his conclustion after estimating the relative sizes of Earth, the Moon, and the Sun and discovering that the Sun was much larger than Earth. But the idea was disregarded until nearly 1,900 years later, largely because of the strength of the prevailing geocentric belief, based on Greek Philosophy and religion, that Earthitself was the center of the solar system.]
[Written records, observatories, monuments, measuring instruments, and other artifacts show that most ancient civilizations not only studied the skies, but did so with considerable accuracy.The Summerians, Babylonians, Egyptians, and Chinese made the first known recorded measurements of the stars and the movement of the planets.
By about the fifth century B.C., Babylonians had identified the region of sky through witch the Sun, Moon, and plantes move as viewed from Earth, and they had named several "planet gods" visible to the human eyes - the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn (the basis of out names for the seven days of the week).]
Considering ancient structures like Stonehenge and some American Indian astronomical
sites, I also wonder if they realized the true structure of the solar system, but never recorded the knowledge.