Daily rise & set of sun, moon, & stars. Daily motion of stars Deductions: 1)Earth spins 2)Spherical shape 3)Moon reflects Sun’s light 4)A coordinate system.

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Presentation transcript:

Daily rise & set of sun, moon, & stars

Daily motion of stars Deductions: 1)Earth spins 2)Spherical shape 3)Moon reflects Sun’s light 4)A coordinate system for the sky

Seasons

Planets: Constellations wanders Ptolome’s geocentric model

Copernicus’ revolution Planet’s retrograde motion Heliocentric model

Kepler’s 3 laws Brahe’s observations 1)planets’ orbit are eccentric 2)A planet sweeps out an equal area per equal time interval 3) Period square is proportional to the semi major axis cube

Kepler’s 3 laws Comparison of orbits P 2 = Ka 3 Shape of orbit Rate of change

Galileo’s proof of heliocentric model Phases of venus

Galileo’s other contributions Lunar craters, moons of Jupiter, & sunspots Inertia Acceleration = rate of change of speed.

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