Earth Motions Astronomy Page 8 ©Mark Place,

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Presentation transcript:

Earth Motions Astronomy Page 8 ©Mark Place, 2007-2008 www.LearnEarthScience.com

How long is one rotation of Earth? Earth's Motions How long is one rotation of Earth? One day - 24 h How long is one revolution of Earth? One year - 365.26 d

Rising and Setting of the Sun Rising and Setting of the Moon Rotation Movement of Stars through the sky The Seasons Changing Constellations Revolution

Earth's rate of rotation? How do you calculate Earth's rate of rotation? One rotation = 360° Time for one rotation = 24 hours 360° ÷ 24 = 15°/hr

How many degrees did the stars move from diagram 1 to diagram 2? 30° (2 hours x 15°)

It’s the only one that didn’t move How can you find Polaris?

Finding Polaris Draw an Arrow on Your picture

Because Polaris can only be seen in the North Northern Because Polaris can only be seen in the North What hemisphere must you be in? Why?

What direction must you be looking? North

What direction do the stars appear to move? counterclockwise

What causes stars to appear to move?

The apparent change in direction of a free swinging pendulum Evidence for Rotation Foucault Pendulum The apparent change in direction of a free swinging pendulum

The “deflection” of an object to the right in the Northern Hemisphere Evidence for Rotation Coriolis Effect The “deflection” of an object to the right in the Northern Hemisphere Plane flying

Sidereal day = actual Earth rotation (Ref. Tables) Solar day = noon to noon Sidereal day = actual Earth rotation (Ref. Tables)

Evidence for Revolution Changing Constellations We see different constellations during different seasons Parallax