There are about 6000 visible stars in the night sky.
They are FAR. The light from our closest star, Proxima Centauri left 4 years
ago!
Essential Question: What is the evidence/observations that show that the Earth orbits the Sun?
PHENOMENON:
What did you observe?
What evidence do you have?
OBJECTS:
Define the system.
What objects are interacting?
Mars appears to have retrograde motion
Venus has phases like the moon
Planets speed changes during orbit
Earth and Sun
MOTION/MODEL:
Describe the motion that in the model that
explains your observations
Heliocentric solar system
Copernicus: Earth and Mars orbit the sun at
different speeds;
Galileo: the Earth and Venus orbit the Sun
Kepler: The planets orbit the Sun and in elliptical
orbits. Distance and pull of gravity change speed.
ONLY Summer constellations:
ONLY Winter constellations:
Parallax
Summary Statement - Answer the Essential Question:
PHENOMENON:
OBJECTS:
MOTION:
Essential Question:
What is evidence
28.2 that the Earth
revolves around the Sun?
1. Galileo
2. Copernicus
3. Kepler
4.
5.
Aristotelian view
has the earth and
sky on fixed spheres

The ancients
imagined that the
Earth was
surrounded by a
canopy of stars
Find constellations that ONLY appear in the Summer sky.
Find ones that ONLY appear in the Winter sky
Summer Constellations
Winter Constellation
Different Zodiac constellations
appear in the sky at different times
during the year
As we revolve around the Sun, the night time Earth faces a
different direction in the sky at different month of the year,
so we see different constellations.
Celestial Portraits



Human brains
naturally create
patterns.
What do you see
when you look at the
clouds?
The ancients did the
same when they
looked up at the sky.
Do you see a
pattern in these
stars?
What constellation is this??
Orion
Orion is only
visible in the fall
& winter
Tell a story

Orion was a mythical
hero and hunter, in his
amorous pursuit of the
Pleiades ( 7 daughters
of the giant Atlas), the
Gods placed them in the
sky. And Orion chases
after them in the sky for
all eternity never to
catch them.

The Gods put Taurus
the Bull to protect them
the daughters.
Orion has his trusty
dogs Canis Major and
Canis Minor to help him.

B
A
http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/007
299181x/78778/Parallax_Nav.swf::Stellar Parallax Interactive
http://highered.mheducation.com/sites/007299181x/student_view0/interactives.html#
Parallax- the apparent shift in position of an object
when the OBSERVER is moving