Heliocentric Solar System
Heliocentric Solar SystemBELLWORK:What did the solar system do
when it wanted to have a party?
plan it!"Eppur Si Muove"(And, yet it moves!") Galileo Galilei
(1564 1642)1610 Siderius Nuncius (The Starry Messenger) Used a
handmade telescope to view the sky.
With his telescope and discoveries, Galileo provided the
EVIDENCE for Copernicus Heliocentric model.3The Moon has mountains,
valleys, craters, just like Earth!So we (Earth) is not so special.
The objects in the solar system are similar.
Galileo Galilei (1564 1642)This went against the ruling Churchs
view that man (who was made by God in his image) and thus Earth was
the center of all things. 4Galileo Galilei (1564 1642)SUNSPOTS
Sunspots on the Sun moved across the face of the Sun, so..What
is the sun doing?
The sun must be rotating, spinning!So..Does the Earth also spin,
rotate?Jupiter Has Moons!
Galileos 4 Moons Io, Europa, Calisto, & GanymedeBig Jupiter
has several moons orbiting it!So..Could the Sun have planets
orbiting it too?Galileo was constructing evidence to prove the
heliocentric model6More evidenceWith his telescope, Galileo
observed that Venus has phases, just like our moon!Over the months
of the year, Venus can be observed changing insize and going
through phases
On your white boards, diagram the Sun, Venus and Earth Show the
motion to describe the Earth observing phase on Venus
Why does the SIZE of Venus change through out the year?8
http://astro.unl.edu/classaction/animations/renaissance/venusphases.htmlanimationNicholas
Copernicus(1500 AD) (a thousand years after Ptolemy In Europe)De
Revolutionibus Orbium Coelestium
The HELIOCENTRIC Model10A New and Improved Model
Using Galileo's observations with the telescope, Copernicus
tried a different model, placing the SUN in the CENTER with the
planets orbiting around it.
HELIOCENTRIC
Lets see if it explains retrograde motion.
Earth1 Sun 6Mars orbit 5 432 Fixed StarsPlanet's apparent path
in the sky.Copernicus Explains Retrograde Motion
123456Earth1 Sun123 4 5 6 6Marsorbit 5 432 Fixed StarsPlanet's
apparent path around sky. Fast Earth overtakes slower outer planets
so they appears to slow down, move in reverse, and then move
forward again with respect to the fixed stars.Copernicus Explains
Retrograde Motion
On the Revolution of the Heavenly Spheres Earth is NOT the
center of everything.The SUN is at the center of the solar system
also, the Stars are much farther away than the SunThe apparent
motion of the stars is a result of the Earths rotation Any observed
movement of the Sun is due to Earths revolution (orbit) and
rotation about the Sun.Retrograde Motion was much simpler to
explainIf..
Key point of his findings. He didnt publish his book until his
death for fear of repercussions from the Church15
