motions of earth, moon, and sun topic 3 remember to wait for the vocabulary word to pop up at the...
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Motions of Earth,
Moon, and Sun
Topic 3
Motions of Earth,
Moon, and Sun
Topic 3 Remember to wait for the vocabulary word to pop up at the end! Can you guess it before it comes
up?
Created by P. Bordas MS, CCC-SLP
Models That Help Explain Apparent Celestial Motions
Geocentric Model
Assumption that the Earth is stationary and that most celestial objects revolve
around it
http://laserstars.org/references/shells.gif
Heliocentric ModelAssumption that the Earth both rotates
on an imaginary axis and revolves around the sun in an orbit. The moon
revolves around the Earth.
http://boojum.as.arizona.edu/~jill/NS102_2006/Lectures/Lecture4/Copernicus_solar_system.gif
Actual Earth Motions
AxisThe imaginary line through the planet from the North Pole to the South Pole
http://www.tiltedearth.org/images/tilted-earth-axis.gif
Foucault PendulumWhen allowed to swing freely, its path will appear to change in a predictable way.
This is evidence of Earth’s rotation because the pendulum – due to inertia –
would continue to swing in the original path if the Earth did not rotate
http://farm1.static.flickr.com/20/70589378_68a6939551.jpg
Coriolis EffectTendency of all particles of matter moving at Earth’s surface to be deflected, or curve
away, from a straight-line path
http://www.seisdeagosto.com/indica/wp-content/uploads/2006/05/Coriolis_effect14.png
ConstellationA group of stars that form a pattern and are used to help people locate celestial objects
http://www.utahskies.org/deepsky/constellations/maps/virgo.jpg
Earth and Moon Motions and Time
Local TimeTime based on the rotation of Earth as
reflected in motions of the sun
Time Zones15-degree-wide longitudinal bands which
maintain the same time, created to standardize time for regions
http://www.radio6767.com/forums/uploaded/ferne/2007112313485_timezonesmap.gif
Actual Motions of Earth’s Moon
TidesThe gravitation between the Earth, the
moon, and the sun results in a cyclic rise and fall of ocean waters on Earth
http://www.atlantickayaktours.com/images/drawings/Navigation/SpringNeap-Tides-color.gif
EclipseWhen a celestial object partly or completely
comes into shadow of another celestial object
http://www.keralatips.org/wp-content/uploads/2007/02/kerala-lunar-eclipse.jpg
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