Earth’s Movements

1. Earth-- spins on an imaginary center line Earth’s axis.

2. rotation--spinning of Earth on its axis,  takes about 24 hours.

3. day/night—caused by rotation
4. Revolution --is Earth’s orbit, or path around the Sun takes one year

5.  year—one revolution around the Sun

6. Earth’s orbit --is elliptical (egg shaped), Earth is closest to Sun around January 3, and farthest from Sun around July 4.

7. Earth’s tilt--  Earth’s axis is tilted 23.5 degrees
8.  tilt—causes Earth to receive different amounts of solar energy from place to place during the year.

9. Northern Hemisphere-- summer begins in June, is tilted toward the Sun.

10. summer-- more hours of sunlight equals solar energy. More solar energy equals more heat.

11. Earth’s tilt-- causes Sun’s radiation to strike the hemispheres at different angles.

12. Summer --happens in  hemisphere tilted toward the Sun,  radiation strikes Earth at a high angle and for longer periods of time.

13. solstice-- the day when the Sun reaches its greatest distance north or south of the equator.

14. Summer solstice--  longest day of the year.

15. Winter solstice-- shortest day of the year.

16. Northern Hemisphere—summer equals winter in Southern Hemisphere

17. Length of day-- affects amount of energy, more energy more heat!

18. equinox -- when the Sun is directly above Earth’s equator.

19.  Spring and Autumnal Equinox--two times a year the Sun is directly over the equator, neither hemisphere tilted toward Sun, equal daylight/equal night both hemisperes.

20. Spring equinox-- March 20 or 21, Autumnal equinox  September 22 or 23.