2.  Claudius Ptolemy lived in Rome around
100 AD. He made a model of the solar
system and a sphere was a advancement
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?