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phy sci
models of the universe and the early astronomy
ancient astronomy
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Plato believed that the universe is
perfect
or
ethereal
and unchanging.
According to Eudoxus of Cnidus, there are
27
interconnected
geocentric
spheres.
Plato
he further described the
stars
embedded in
outer space
as eternal and divine.
aristotle
in conjunction to Eudoxus model he added 3 spheres to jupiter and
mars
; 4 spheres to sun, moon, venus and
mercury.
Claudius Ptolemny
earth is a
spherical
object
the stars are
fixed
bodies attached to a solid
spherical
exterior part of the universe
planets move
independently
of the fixed stars, and sometimes, the planets seem to
reverse
their motion.
Aristarchus of Samos
he stated that the
sun
and stars are
fixed.
estimated the
sizes
of the
sun
and moon as compared to Earth's size
estimated the distances from the earth to the sun and moon (sun is about 18-20x farther away from earth than moon)
moon's
diameter
0.32-0.40x
sun's diameter
6.3-7.2x