Aristarchus

died at age 80310 BC – 230 BC

Home Country: Aristarchus

Greek island, Samos

Astronomic Accomplishment 1: Aristarchus

first person to present an explicit argument for a heliocentric model of the solar system,

placing the Sun, not the Earth, at the center of the known universe

Astronomic Accomplishment 2: Aristarchus

he had both identified the central fire with the Sun, as well as putting other planets in

correct order from the Sun

Interesting Fact 1: Aristarchus

the view of Aristarchus conflicted with the common teaching of the astronomers

Interesting Fact 2: Aristarchus

the crater Aristarchus on the Moon is named in his honor

Aristarchus

Eratosthenes

276 BC – 195 BC died at 81

Home Countries: Eratosthenes

Cyrene, North Africa (now Shahhat, Libya)Athens, Greece

Alexandria, Egypt

Astronomic Accomplishment 1: Eratosthenes

measured the altitude of the noontime sun

Astronomic Accomplishment 2: Eratosthenes

measured the diameter of the earth and the tilt of the earth's axis

Astronomic Accomplishment 3: Eratosthenes

accurately calculated the distance from the earth to the sun and invented the leap day

Astronomic Accomplishment 4: Eratosthenes

created a map of the world based on the available geographical knowledge of the era

Interesting Fact 1: Eratosthenes

He was nicknamed Beta (the second letter of the Greek alphabet) because because he supposedly proved himself to be the second best in the world

in almost any field also nicknamed Pentathlos because it’s used to describe someone who was well-rounded, or good at several different things.

Interesting Fact 2: Eratosthenes

He was the librarian for the great

Alexandrian University after Ptolemy III of Egypt passed away.

Ptolemy III Eratosthenes