our visions of the cosmos often took the shape of diagrams—representing what we believed about our solar system. What’s remarkable about Claudius Ptolemy’s vision of the universe is that it ...

In ancient Greece, astronomer and mathematician Claudius Ptolemy (A.D. 90–168) set up a model of the solar system in which the sun, stars, and other planets revolved around Earth. Known as the ...

An Egyptian astronomer called Ptolemy (AD100-168) described one of the earliest ideas for how the Solar System is structured. Ptolemy’s model and many earlier ideas of the Solar System had the ...

Ptolemy and others explained this using a ... Putting the Sun at the center of our Solar System, other astronomers began to realize, simplified the orbits for the planets. And it helped explain ...

Ancient Greek astronomers produced geocentric (Earth-centred) models of the solar system, which reached their pinnacle with the work of Ptolemy. This model, from an Arabic copy of Ptolemy’s ...

Ptolemy’s geocentric model of the solar system was very systematic, mechanistic, and could explain the movements of celestial bodies so well that it had been widely accepted as the truth ...

That Ptolemy was an arm-chair geographer no one denies, but in geography, at least, it should be remembered that the looker-on often sees most of the game. Basing his system on that of his ...

The Ptolemy team have been surprised by the results ... from diverse building blocks during its formation in the solar system. Alternatively it is the result of uneven heating in its journey ...

Did Ptolemy breathe in cometary gases ... for life were present in a body which formed in the earliest stages of solar system history. Comets act as messengers, delivering water and dust ...