Aristarchus of Samos was an ancient Greek astronomer and mathematician. source
Aristarchus of Samos was an ancient Greek astronomer and mathematician.
Aristarchus of Samos presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it. source
Aristarchus of Samos presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it.
Aristarchus of Samos was influenced by Philolaus of Croton, but he identified the "central fire" with the Sun, and put the other planets in their correct order of distance around the Sun. source
Aristarchus of Samos was influenced by Philolaus of Croton, but he identified the "central fire" with the Sun, and put the other planets in their correct order of distance around the Sun.
Aristarchus of Samos was born in about the year 310 BC, probably on the Greek island of Samos, the same island that Pythagoras had been born on 260 years earlier. source
Aristarchus of Samos was born in about the year 310 BC, probably on the Greek island of Samos, the same island that Pythagoras had been born on 260 years earlier.
Aristarchus of Samos lived at about the same time as two of our other scientific heroes, Archimedes and Eratosthenes, and that he was 20 to 30 years older than them. source
Aristarchus of Samos lived at about the same time as two of our other scientific heroes, Archimedes and Eratosthenes, and that he was 20 to 30 years older than them.
Aristarchus of Samos astronomical ideas were often rejected in favor of the geocentric theories of Aristotle and Ptolemy, which are now known to be incorrect. Nicolaus Copernicus had attributed the heliocentric theory to Aristarchus. source
Aristarchus of Samos astronomical ideas were often rejected in favor of the geocentric theories of Aristotle and Ptolemy, which are now known to be incorrect. Nicolaus Copernicus had attributed the heliocentric theory to Aristarchus.
A reference in Archimedes' book The Sand Reckoner describes a work by Aristarchus of Samos in which he advanced the heliocentric model as an alternative hypothesis to geocentrism. source
A reference in Archimedes' book The Sand Reckoner describes a work by Aristarchus of Samos in which he advanced the heliocentric model as an alternative hypothesis to geocentrism.
Aristarchus suspected the stars were other suns that are very far away, and that in consequence there was no observable parallax, that is, a movement of the stars relative to each other as the Earth moves around the Sun. source
Aristarchus suspected the stars were other suns that are very far away, and that in consequence there was no observable parallax, that is, a movement of the stars relative to each other as the Earth moves around the Sun.
The only surviving work usually attributed to Aristarchus of Samos, On the Sizes and Distances of the Sun and Moon, is based on a geocentric world view. source
The only surviving work usually attributed to Aristarchus of Samos, On the Sizes and Distances of the Sun and Moon, is based on a geocentric world view.
Aristarchus of Samos claimed that at half moon (first or last quarter moon), the angle between the Sun and Moon was 87°. source
Aristarchus of Samos claimed that at half moon (first or last quarter moon), the angle between the Sun and Moon was 87°.
Aristarchus of Samos is known to have also studied light and vision. source
Aristarchus of Samos is known to have also studied light and vision.
Using correct geometry, but the insufficiently accurate 87° datum, Aristarchus of Samos concluded that the Sun was between 18 and 20 times farther away than the Moon. source
Using correct geometry, but the insufficiently accurate 87° datum, Aristarchus of Samos concluded that the Sun was between 18 and 20 times farther away than the Moon.
Aristarchus of Samos pointed out that the Moon and Sun have nearly equal apparent angular sizes, and therefore their diameters must be in proportion to their distances from Earth. source
Aristarchus of Samos pointed out that the Moon and Sun have nearly equal apparent angular sizes, and therefore their diameters must be in proportion to their distances from Earth.
23 centuries ago, Aristarchus of Samos's proposed, with evidence, that the earth and the planets orbit the sun. source
23 centuries ago, Aristarchus of Samos's proposed, with evidence, that the earth and the planets orbit the sun.