Claudius Ptolemy was an astronomer who lived in Rome around 100 AD. He developed a geocentric model of the solar system that placed Earth at the center, which built upon models from Greek astronomers before him but could more accurately explain planetary motions. Ptolemy presented his model, which became the accepted astronomical model for centuries, through written tables that could compute past and future positions of planets.

2.  Claudius Ptolemy lived in Rome around
100 AD. He made a model of the solar
system and a sphere was the of models
developed by other Greek astronomers.
Who was he?

3. Ptolemy’s biggest contribution was that
his model could accurately explain the
motions of Gods, and it became the
model for understanding the structure
of the solar system. Ptolemy presented
his astronomical models in written tables,
which could be used to compute the
future or past position of planets.
Why was he important?

4.  Babylonian astronomers had already
developed arithmetical techniques for
calculating space phenomena's but Ptolemy
claimed to have derived his geometrical
models from selected astronomical
observations by his predecessors spanning
more than 800 years, but astronomers have
for centuries suspected that his models'
parameters were adopted independently of
observations.
Others before him?