By Isabelle Puntoriero

Name of person\organisation:

Claudius Ptlomeny

Date\s of discover\ies:

Ptlomeny presened his Geocentric theory-the earth the centre of the universe with the sun,moon,planets and stars revolving around it in circular orbits,in the 2nd century A.D (in the Christian era).

Technologies used at the time:

The instruments:

Armillary Spheres

Ptlomeny's Ruler's

Paper Instruments

Contribution they made to our knowledge and understanding the solar system:

This model of the solar system was usedfor 1400 years until the time of Copernicus

Ptlomeny is also famous for his geography.He was the fist person to use longitube and latitude lines to identify plces on the fce of the Earth