Earth Motions

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Suns Path -Intro
Astronomy
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Part 1 - Earth's Motions
A. What is the rotation of Earth?
Spinning on the N/S axis Like a top!
B What is the revolution of Earth?
Moving in an orbit around the Sun
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Part 1 - Earth's Motions
A. How long is one rotation of Earth?
One day 24 Hours
B - How long is one revolution of Earth?
One year 365.24 days
Or 8765 hours, 526,000 minutes, 31.6 million
seconds
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Rising and Setting of the Sun
Rotation
Changing Constellations
Movement of Stars through the sky
Rising and Setting of the Moon
The Seasons
Revolution
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How do you calculate Earth's rate of rotation?
One rotation 360
Time for one rotation 24 hours
360 24 15/hr
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How many degrees did the stars move from diagram
1 to diagram 2?
(2 hours x 15) 30
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How can you find Polaris?
Its the only one that didnt move
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What hemisphere must you be in? Why?
Northern Because Polaris can only been seen in
the North
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What direction must you be looking?
North
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What direction do the stars appear to move?
Counterclockwise!
http//astro.unl.edu/classaction/animations/ancien
tastro/dipperclock.html
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What causes the stars appear to move?
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Evidence for Rotation
Foucault Pendulum
Coriolis Effect
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Evidence for Revolution
Changing Constellations
Parallax
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