The document discusses various facts about the Earth's rotation: 1) Day and night are caused by the Earth's rotation on its axis, with the sun rising in the east and setting in the west. 2) A sidereal day is 23 hours, 56 minutes and 4 seconds because the Earth moves slightly in its orbit each day. 3) Scientists can predict and track the Earth's rotation using satellite laser ranging, GPS satellites, and lunar laser ranging.

1. by: Sam Oncken

2. The Earth rotates and this
happens…
 Day and night are caused by Earth rotating.
No.1
 Because of Earths rotation the sun rises in the
east and sets in the west. No. 1
 Even though it looks like the sun and stars are
moving it is the Earth that is actually moving.
No. 4

3. Solar/Sidereal day
 The Earth rotates more than once per solar
day because it moves a little in its orbit
around the sun each day. No. 2
 A sidereal ay is not one full day but 23 hours
56 minutes and 4 seconds No. 2

4. Circumferences of…
 The circumference of Earths equator is
25,000 miles long. No. 5
 The circumference of Earths orbit around the
sun is 940 million kilometers. No. 5

5. Axis equator differences/facts
 The Earths rotates on its axis. No. 1
 The axis is the imaginary line in the middle of
Earth. No.5
 The earths axis could be called its rotational
axis. No.1
 The equator is the imaginary line that is zero
degrees latitude which cuts Earth in two.
 The axis connects the north and the south
poles. No. 2

6. How Earths rotation is
predicted…
 Scientist predict Earths rotation with Satellite
Laser Ranging. No. 3
 Also with the Global Positioning system and
Satellites. No. 3
 Also Lunar Laser ranging. No. 3
 With these brings information for the future.
No. 3

7. Northern tip of Earth and
Southern tip of the Earth…
 The Northern tip of Earth and the southern tip of Earth
are different amounts away from the sun. No. 4
 The Northern hemisphere is the closest to the sun on
June 21,22and the southern hemisphere is the closest to
the sun on December 21,22. No. 4
 The days are short in the winter in some places because
as the earth is spinning and rotating the sun the North
pole doesn’t always tilt toward the sun. No. 4
 When Earth is closest to the sun it is summer and when
Earth is farther fro the sun it is winter. No 4

8. What Revolution is.
 A revolution is the orbiting of the orbiting of
the sun that brings Earths seasons. No. 1
 We celebrate leap year because the
revolution is not completely 365 days so we
add a day every 4 years. No. 1
 The Earths revolution is basically Earth
orbiting the sun. No. 1

9. Earth rotation speed/change
 The Earth rotates at a rate of 1000 miles per
hour. No.1
 Over thousands of years the Earth changes
due to precession. No. 1
 The Earth rotates 86,164 seconds.No.2

10. Data Chart Leap year

11. Data Chart Leap year dates

12. Credits
1. The Earths rotation, Randy Russell, January 13, 2005, March 8, 2012,
http://www.window2universe.org/theuniverse/uts/earths2.html
2. observing the sky: motion of Earth –rotation, office of naval research, March 8, 2012,
http://www.onr.navy.mil/focus/spacesciences/observingsky/motion1.htm
3. IERS Rapid Service/Prediction Center, U.S Naval Observatory, June 2008, March 8, 2012,
http://maia.usno.navy .mil
4. The days the sun stands still, Debora Dyess, KidsKnowIt, 2012, March 8, 2012,
http://www.kidsgeo.com/geography-for-kids/0020b-solstices-and-equinoxes.php
5. Speed of the Earth’s rotation, Paul Butterworth, David Palmer, Ask a astronimist team,
December 01, 2005, March 9, 2012,
http://www.imagine.gsfc.nasa.gov/docs/ask_astro?answers/9740lc.html