Galileo didnt like being told what to think
o led to his dropping out of Med School and becoming a
mathematician/inventor living in Venice
invented geometric/military compass which he gained fame and money from by
Tycho Brahe and his Cosmology
-born the highest stratum of Danish nobility, set him up for a life of leisure which allowed
-begins to make regular and detailed observations of the heavens in 1563 every night the
sky was clear (continued f
Believed truth must be the final end of the whole universe, Jesus came to earth
and said For this I was born, and unto this I came into the World, to give
testimony to the truth.
He created a Christianity based on Aristotle and published h
o argued for a world without beginning or end
o composed ultimately of fire.
o (water being fire liquefied and earth fire solidified).
o Everything gives way, nothing stays fixed
o meaning change is being permanent.
o Stars are fire caught in
o believed each planet was divine
o attributed uniform circular motion to these beings
o (made of aether).
o Accepted Aristotles idea of an unmoved-mover as the cause of the daily rotation
of the celestial sphere.
o Asserted that planets move by
o great mathematician
o able to produce models of the celestial realm that were extremely accurate and
could be used to make predictions.
Solar Model: Same as Hipparchuss except he preferred the eccentric since it used only
one circle therefore s
Early Christianity and Cosmology
-Big Issues in Early Christianity
Why do angels have wings?
Why do holy people have halos? (perfect shape)
Creation story was a huge issue because they couldnt have a perfect thing
creating evil (why would he do this?)
-Geocentric model of movable eccentrics
the Moon orbits Earth in 27 days
the Sun orbits the Earth in 1 year
(the Suns orbital circle is much bigger than that of the moon).
Venus and Mercury had small, circular orbits, with Mercurys
Post Aristotle Astronomy
-Contemporary of Plate
great mathematician who wrote much of what is contained in 5th book of Euclids
Predicted solar eclipse
proposed the idea of a leap year
introduced the concept of homocentric
He challenged Aristotelian view that people are inherently virtuous, and that the
goal of political leadership is to produce a just society.
Argues that men are venal and that a good rules should manipulate and control the
populace by exploit
Early Islam and Cosmology
Islam quickly welcomed astronomers because they realized the role they could
play in helping them regulate their prayer times in different areas and adjusting
for time changes over time.
Also they wanted to pray in the directio