Seleucus of Seleucia was an ancient astronomer who defended heliocentrism, arguing that Earth orbits the Sun and rotates on ...

“Certainly,” Gingerich says, “Ptolemy did not commit fraud. And his great contribution of the geocentric theory,” he adds, “was the true testament to Ptolemy’s greatness as an astronomer.

Why would the universe be arranged in any other way ... However, our Moon didn’t quite fit his model. Ptolemy suggested that its orbital path must be tilted with respect to the other heavenly ...

Now researchers have managed to recover the text written by Ptolemy on a parchment that suffered such a previous recovery attempt. Outermost six rings of the meteoroscope, not to scale.

AT the meeting on Monday of the Royal Geographical Society, Dr. H. Schlichter read a paper on “Ptolemy's Geography of Eastern Equatorial Africa.” Ptolemy, as a geographer, has received very ...

Ptolemy’s model and many earlier ideas of the Solar System had the Earth at the centre of it. As observations of the motions of the planets became more detailed, the descriptions of the Solar ...