Angular size of moon= . 548 deg
Angular size of the sun= . 531 deg
Orbital radius of moon= 363,000 km
Nicholas Copernicus 14731543 Copernican model.
DeRevolutionibus Orbium
Coelestium
sun in center, established order of planets, Earth spun, explains retrograde
motion, only ever gave pamphlets to friends.
Giordano Bruno Espoused Copernicus,
stellar sphere just a construct.
Occam’s Razor simpler model better.
Modelsscience as a thought experiment celestial
objects as perfect, immutable –Pythagoreans. Spheres spin at constant speed. Geocentric
model Earth as center. Aristotle, 350 BC. 55 celestial spheres outermost sphere fixed in
sphere.
Cannonball does not always hit the ground.
8km/s is the speed to orbit the earth.
Mass of cannonball does not effect orbit. Eccentricity defined as c/a. Pluto’s orbit is fastest
at its perihelion. Slowest at the aphelion. Haley’s comet spends most of its time at the
aphelion. Jupiter; 5 AU=11 years.
P = the cubed root of r cubed. a= p raised to the 2/3
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 Fall '08
 HORNSTEIN
 Astronomy, deg Orbital radius, deg Angular size, spheres outermost sphere

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