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?

MOTION/MODEL:

Describe the motion that in the model that explains your observations

Mars appears to have retrograde motion Venus has phases like the moon Planets speed changes during orbit

Earth and Sun

ONLY Summer constellations:

ONLY Winter constellations:

Parallax

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.

Summary Statement - Answer the Essential Question:

PHENOMENON:

OBJECTS:

MOTION:

28.2

Essential Question: What is evidence 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

Summer Constellations Winter Constellation

Find constellations that ONLY appear in the Summer sky. Find ones that ONLY appear in the Winter sky

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?

Orion What constellation is this??

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.

A

B

http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/007299181x/78778/Parallax_Nav.swf::Stellar Parallax Interactivehttp://highered.mheducation.com/sites/007299181x/student_view0/interactives.html#

Parallax- the apparent shift in position of an object when the OBSERVER is moving