When did aristarchus of samos propose his heliocentric model?

The word "helios" in Greek means "sun." Heliocentric means that the sun is at the center. A heliocentric system is one in which the planets revolve around a fixed sun.
Aristarchus of Samos proposed the heliocentric model in 200 Bc. It was not accepted at that time because people believed in the geocentric model and believed that the earth was the center of the universe.

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.

Where are the following questions