Claudius Ptolemy was a Greek mathematician, astronomer and geographer who lived in the Egyptian city of Alexandria while under the rule of the Roman Empire. Much of medieval astronomy and ...

Simplified reconstruction of Ptolemy's nine-ringed astronomical instrument called "Meteoroscope," as described in the hidden manuscript. It was a tool to calculate heights and distances, often in ...

Most notable, this revealed Ptolemy’s treatise on the Meteoroscope, which is an instrument for measuring the position, length, and direction of the apparent path of a shooting star.

The other pages of the manuscript contain text of another work of Ptolemy’s called On the Analemma, which was read in 1895 by the Danish scholar J.L. Heiberg.

JUST forty years ago the late Prof. Peters, of Clinton, New York, and Mr. Knobel began independently, and without either of them knowing of the other's work, to investigate the Catalogue of Stars ...

There are many arguments over what makes a theory beautiful, elegant, or compelling. But in the face of data, predictive power is everything.

A famous Greek astronomer and cartographer, Ptolemy's map of Ireland is incredibly accurate even though it was penned way back in 140AD. A map created by Greek astronomer and cartographer Claudius ...

But Ptolemy thought the world was 30 percent smaller than it actually is; worse, the mapmaker was using Arabian miles, which were longer than Italian ones.