History of Astronomers
Category: Other
Updated: 21 Oct 2018
Contributors
Created byStephanie Szczech
Attachments
Events
500 BCE0500 CE1000 CE1500 CE2000 CEAristotle creates the geo-
centric model referencing
that the Earth is the center
of the universe.Aristotle says that
the movement of
stars and planets
are perfectly circular.Ptolemy believes the geocentric
theory and states that planets
must move on epicycles.Ptolemy also believes that the model
observed the paths of five planets
including the sun and the moon.Copernicus asserts that the Earth sits
on its axis and rotates while orbiting
the sun.Copernicus rediscovers the Heliocentric
theory where as the Earth is no longer
the center of the universe.He accounts of planetary
retrograde motion.Galileo builds a telescope
for himself.Makes observation that
Jupiter has moons.Galileo observes that
the sun has imperfections
and it rotates.Discovers that Venus has
phases.Galileo states that
the moon has mountains,
valleys, and craters.Brahe makes observations
of a supernova.Brahe observes a comet.Brahe supports heliocentric model
but personally believes the Earth
was motionless and the center of
our universe.Brahe compiles information
on planet Mars.Kepler finds that planetary
orbits are ellipses with the sun
at one focus.Kepler states that an imaginary
line connecting the sun and planet
sweeps out equal areas in equal time.Kepler says square of
period of planet's orbital motion
is proportional to cube of
semimajor axis.
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