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Earth Rotation
Rotation
Geocentric Model
• Earth centered solar system
• Old model – disproven
Heliocentric
• Sun centered solar system
• Correct model
• Earth rotating on an axis and revolving around the sun
OMG I’ve seen Focault’s Pendulum
Paris is the most romantic city!!!!
Wow what a Ceiling!!!
Pantheon France
Ohhhh Pendulum pendulum
Evidence for Heliocentric model
• Focault’s Pendulum
• Free swinging pendulum
“appears” to change
direction without
interference
• The apparent change
occurs because the floor
under it is moving (Earth
is rotating)
Coriolis Effect
• Deflection of winds and
oceans due to the
Earths rotation.
• Earth is spinning West
to East therefore in the
north the currents are
deflected to the right.
• Southern hemisphere
they are deflected to
the left
Ocean Current Map
*****Use your Reference table
Turn to page 4 of your reference table
Faster!!!!!!!!!!!!!!!!
Earth Rotation
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Earth spins on an axis (that is tilted 23.5 degrees)
Spins once per day (360 degrees per 24 hrs)
15 degrees per hour
Rotates west to East
So the sun appear to rise in the East and sets in
the west
• http://www.onr.navy.mil/focus/spacesciences/ob
servingsky/motion1.htm
Effects of Earths Rotation
Provides evidence of Rotation
• 1. Focault’s Pendulum
• 2. Coriolis Effect
Effects of Rotation that do not prove Earth is
rotating
1. Star Trails – Stars leave streaks in the sky (15
degrees per hour)
2. Change of day and night
Star Trails
• All stars in the north
appear to rotate around
polaris (north star)
• To measure the length
of time the film
exposed
• Measure the angle of
the arc of the trail
Facing North
Facing West
Facing East