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4/21 & 4/22 - 8th Grade Agenda
Learning Objective: Learn about early model
of the solar system
Collect HW: Reading & Notetaking p.233 – 234
Video: When we left Earth
Textbook Reading: p.520 - 524
HW: Reading & Notetaking p.236– 237
Daily Reflection
• Prompt: Write 3 questions about the solar
Until about 500 years ago,
people thought that the Earth
was the center of the universe
• What made them
come to this
Even the Greek Astronomers
thought the heavens rotated
around the Earth
• In A.D. 140, Ptolemy
had to explain the
wobble in the
planet’s motion by
having the planets
move in a circles
with in a circle
Ancient Greeks believe in a
geocentric system
• They wrongly
believed that the
Earth was at the
center of the
• This view remained
the accepted view
until 1600.
What kind of a model did
Copernicus propose in early
• Heliocentric
Model with the
Sun at the
• But most people
still believed in
the Geocentric
Heliocentric system was
accepted until the 1660s
• In a heliocentric system, earth
and the other planets orbit
around the sun.
• Copernicus first proposed the
heliocentric model in 1543.
• People (Galileo & Giordano
Bruno) were jailed and burned
for proposing the Heliocentric
What key observations did
Galileo make in 1600s?
Moons of Jupiter
Phases of Venus
just like the moon
How did Galileo’s observations
help convince others that
Copernicus’s was correct?
Kepler discovered that orbit of
each planet is an e______
of a c______
Kepler’s Laws
• Kepler’s 1st Law: Planet’s
obit is an elipse
• Kepler’s 2nd Law: Planets
move faster when it is
closer to the sun
• Kepler’s 3rd Law: Planets
closer to the sun orbit the
sun faster than planets
that are farther from the