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Q: How many planets were in Ptolemy time?
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Related questions

How many planets did ptolemy discover?

321


Who belived that the planets move in epicycles?

Ptolemy.


How many planets did ptolemy know about when he made his map of the solar system?

67 of them .they ade trev


How was Copernicus model of the universe different from ptolemy's?

Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the moon.No. The above answer is incorrect.Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the EARTH in epicycles. Not the moon. (The model that modeled the planets orbiting earth was the Geocentric model. Aristotle theorized this.)Copernicus's model is known as the Heliocentric model. Ptolemy's theory of epicycles is when the planets revolved in large circles around Earth.


How was Copernicus model of the universe different from Ptolemy's model?

Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the moon.No. The above answer is incorrect.Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the EARTH in epicycles. Not the moon. (The model that modeled the planets orbiting earth was the Geocentric model. Aristotle theorized this.)Copernicus's model is known as the Heliocentric model. Ptolemy's theory of epicycles is when the planets revolved in large circles around Earth.


What was Ptolemy's idea on space?

that the earth was in the middle of the universe


Who proposed the reason that planets orbit the sun?

i think ptolemy


What was Ptolemy trying to explain in his model by haven't the planets move on smaller circles that move big circles?

ptolemy did something


Did Galileo's observations confirm the validity of retrograde motion of the planets?

No, Ptolemy did.


How did Ptolemy prove his model?

Galileo explained the backwatds motion of the planets


Which assuptions do ptolemy and Copernicus disagree upon?

Ptolemy thought the earth was the center of the universe, so that the stars, the other planets and the sun revolved around the earth; Copernicus realized that for the orbits of the planets to make sense, the earth and the other planets had to revolve around the sun.


What was ptolemy theory on planets?

The astronomical system of Ptolemy, in which the earth is at the center of the universe with the sun, moon, planets, and stars revolving about it in circular orbits.Ptolemaic system Ptolemy believed that Earth was at the center of the universe and that the Sun and planets orbited Earth (with the planets also moving in smaller circles called epicycles). In this system, the centers of Mercury's and Venus's epicycles always lie on the line shown in the diagram between the Earth and the Sun.