Topic: Earth’s Motions

Rotation Earth spins on its axis at a rate of _ o /hr __ mph at the Equator __ mph at our latitude Do you feel it?

Looking down on the Earth's North Pole, it is ____

Prove Earth Rotates!

____

Star Trails

Star trails also show that Earth rotates

Credit & Copyright: Wally Pacholka Polaris

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? ____