Some Greeks from ASTR 201 flashcards

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Front (Question)

Some Greeks

Back (Answer)

Plato (428 - 348 BC)

All natural motion is circular
Reason is more important than observation

Eratosthenes (276 - 195 BC)

He measured the circumference of the Earth.
The Sun is at the zenith in the city of Syene at noon on the
summer solstice.
But at the same time in Alexandria, it is 7 from the zenith.

Eratosthenes inferred that

He measured the circumference of the Earth.
The Sun is at the zenith in the city of Syene at noon on the summer solstice.
But at the same time in Alexandria, it is 7 from the zenith
Alexandria was 7 of latitude north of Syene.
The distance between the two cities is 7/360 times the Earth's circumference.
His result of 42,000 km is very close to the right number: 40,000 km.

Claudius Ptolemy (AD 100-170) - Almagest

star catalogue
instruments
motions & model of planets, Sun, Moon

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