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Transcript 
Earth’s Place
in the Universe
Revolution, Rotation, &
Location
The Sun
 Center
of our solar system
 Source
of all energy in our
solar system
 Moves
as planets tug on it so it
orbits the solar system’s midpoint
or barycenter
Barycenter
Point between two objects where they
balance each other
 barycenter animation

Movements of Earth
Revolution: The movement of
the Earth around the sun.
The
Earth moves around the Sun
constantly at an average speed of
106,000 km/hr.
Revolution
(or Orbital Period) =
365.24 days
Movements of Earth
Rotation: The movement of the
Earth as it spins on its axis.

1 rotation = 24 hours

side facing sun = daytime
side facing away from sun =
nighttime

creates the “setting” and “rising”
appearance of the sun

The Revolving Earth
Because of the elliptical shape of
the orbit, the earth is not always
the same distance from the sun
(perihelion & aphelion)
The Revolving Earth
 The
“tilt” of Earth’s axis is about
23.5 degrees
 As
the earth revolves around the
sun, its point of axis does not
change – always points to Polaris
(North Star) for now
Precession
Change in direction of axis, without any
change in tilt
 Changes stars near the Pole but does
not affect seasons (angle stays same)
 Like a spinning top
 Polaris will not always
be the North Star
Precession video

The Revolving Earth
 When
the point of axis is TOWARD
the Sun
 Northern
Hemisphere has longer
periods of daylight & warm
temperatures (summer)
 Southern
Hemisphere has shorter
periods of daylight & cooler
temperatures (winter)
The Revolving Earth
 When
the point of axis is AWAY from
the Sun
 Southern
Hemisphere has longer
periods of daylight & warm
temperatures (summer)
 Northern
Hemisphere has shorter
periods of daylight & cooler
temperatures (winter)
Northern & Southern Hemispheres
NORTHERN HEMISPHERE
EQUATOR
SOUTHERN HEMISPHERE
The Revolving Earth
http://www.classzone.com/books/earth_science/
terc/content/visualizations/es0408/es0408pag
e01.cfm?chapter_no=visualization
Nutation
Wobbling around the axis
 Changes the angle by ½ degree one way
or the other
 Occurs over 18 year period
 Caused by moon
 Slight decrease or increase of seasons

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