Heliocentrist Aristarchus of Samos lived ~310-230 BCE. Archimedes ~287-212 BCE. They shared a lot of years in common. We know Archi knew about Ari, because of his work The Sand Reckoner [https://en.wikipedia.org/wiki/The_Sand_Reckoner]:
"Archimedes then estimated an upper bound for the number of grains of sand required to fill the Universe. To do this, he used the heliocentric model of Aristarchus of Samos. The original work by Aristarchus has been lost. This work by Archimedes however is one of the few surviving references to his theory...."
"Archimedes then estimated an upper bound for the number of grains of sand required to fill the Universe. To do this, he used the heliocentric model of Aristarchus of Samos. The original work by Aristarchus has been lost. This work by Archimedes however is one of the few surviving references to his theory...."