Topic: Earth’s Motions
Rotation
• Earth spins on its axis at a rate of _o/hr
__ mph at our latitude
__ mph at the Equator
Do you feel it?
• Looking down on the Earth's North
Pole, it is ____
Prove Earth Rotates!
____
http://commons.wikimedia.org/wiki/Image:Foucault_pendulum_animated.gif
Star Trails
Star trails also
show that Earth
rotates
Polaris
Credit & Copyright: Wally Pacholka
Remember how to find Polaris
(North Star)?
Coriolis Effect
Northern hemisphere objects deflect:
_____
Southern hemisphere objects deflect:
_____
Navigators must allow for deviation to right when
flying in northern hemisphere -- and to left in
southern hemisphere.
The rotation of the earth creates
special problems on flights to
and from the moon.
Periods of Rotation
Sidereal Day: based on position of stars
= 23 hrs 56 min 4 sec
Page 15 of ESRT!!
Synodic Day: based on position of Sun
= 24 hrs
Sidereal Day—ESRT pg 15
1) Rotation
 Spins on axis __°/hr
 Evidence
1) __
2) __
3) __
 Period of rotation
 Sidereal ___
 Synodic ___
 Effects
1) ___
Revolution
Sun
Fastest human = ~27 mph
Cheetah = 46 mph
Fastest car = 267 mph
Planes = up to 2,200 mph
Earth revolves around sun = ___ mph
Constellations
ESRT pg 15
2) Revolution
• ___
Evidence
1) ___
Period of revolution
___
FQ:
• What causes the Coriolis Effect?
• How does it effect the Northern Hemisphere?
• ____