Think About It:

For 1,700 years what did
we believe about the Earth
and the Sun and their
motions? Why did we
believe that?
Aim: How do we prove the earth
rotates and revolves?
Topic: Unit 8 Astronomy
Main Idea: Heliocentric and Geocentric Views
1) What does the word “geocentric”
mean?

“earth-centered”; this is the view
that the earth is the center of the
universe.
What was the “heliocentric view”?

This was the view that the earth and
planets revolved around the sun.
2) Why do planets look like they
are moving backward at certain
points?

At times in
our orbit
around the
sun, we
move faster
so another
planet looks
like it’s going
backward.
3) What are the two terrestrial motions?


Rotation= the
counterclockwise
spinning on an axis at
a rate of 15 degrees
per hour
Revolution= one object
going around another
(earth revolves
counterclockwise at a
rate of 1 degree per
day)
Why were the pegs knocked down
by the Foucault pendulum?

The earth rotated under them; fastest at
the equator and slowest at the poles.
Proof of Rotation
Proof of Revolution
Evidence
Rotation
Day and night
Coriolis effect
Foucault pendulum
Revolution
seasons
Changing
constellations
Exit Card
Use tonight’s
homework questions 1,
5, 7 & 10