Question

which astronomer proposed that the earth and other planets revolved around the sun?
aristarchus
eratosthenes
ptolemy
alexander

Explanation:

Aristarchus of Samos was an ancient Greek astronomer who first proposed the heliocentric model, stating that Earth and other planets revolve around the Sun. Eratosthenes calculated Earth's circumference; Ptolemy advocated the geocentric model; Alexander was a Macedonian ruler, not an astronomer focused on planetary motion.

Answer:

Aristarchus