Question

Which contribution did Ptolemy make to our view of the solar system?

A.
He proposed the sun-centered model of the solar system.

B.
He showed that planets moved in elliptical orbits.

C.
He proposed that gravity kept the planets in their orbits.

D.
He proposed the earth-centered model of the solar system.

Answer 1

@matt101 @Avvery159

Answer 2

Don't know this off the top of my head. Have a look at the wikipedia article for Ptolemy and see if you can find your answer there!

Answer 3

http://en.wikipedia.org/wiki/Geocentric_model There is the wiki for it

Answer 4

i think it is A or B

Answer 5

Its not A

Answer 6

His thing says earth was at the center

Answer 7

"In astronomy, the Geocentric Model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies."

Answer 8

Its D

Answer 9

Are you 100% sure its D

Answer 10

Yes

Answer 11

ok thx

Answer 12

Ptolemy, Latin in full Claudius Ptolemaeus (fl. AD 127-145, Alexandria), ancient astronomer, geographer, and mathematician who considered the Earth the center of the universe (the "Ptolemaic system"). Virtually nothing is known about his life.

Answer 13

ok

Answer 14

Sounds good to me

Answer 15

He proposed the earth-centered model of the solar system.