1. Movement of the Earth
Created By:
Mr. Kreeger

2. Homework and Page References
HW #1- In one to two paragraphs explain where the direct rays of the sun are located at the beginning of each of the 4 seasons. What effect does this have on the temperature and altitude of the sun in NY
HW # pg 460, 5-8 pg 464
HW # pg 466, pg 469

3. Table of Contents Rotation Revolution Results of the Earth’s Tilt
Evidence
Rate (Board Activity)
Revolution
Results of the Earth’s Tilt
Seasons

4. Introduction Video
Movement of Earth

5. 1. Rotation
Rotation- The spinning motion of the Earth on it’s axis. 1 complete rotation takes 24 hours=1 day.
Evidence
Foucault's Pendulum- Changes direction of swing over time
Coriolis Effect-Deflection of wind or water to right in NH
Rate-Depends on Latitude (Board Activity)

6. 2. Revolution
Revolution- The movement of earth around the sun. It takes 365 days or one year to completely revolve.
Closet pt-1.47*10^8km (Perihelion)
Furthest pt- 1.52*10^8km (Aphelion)
Evidence-Different star constellations visible throughout year.
Rate-(Board Activity)

8. Visual Representation of Revolution of the Earth

9. 3. Results of the Earth’s Tilt
Earth tilted 23.5 from perpendicular to the plane of the orbit.
Direction of axis is always constant (North Star)
North Pole tilted toward sun- NH longer days
South Pole tilted toward sun- SH longer days.

10. Introduction to the Seasons

11. 4. Seasons Causes Earth’s revolution Tilt of the earth on its axis
Higher sun is in the sky Longer day  More energy
Lower sun is in the sky  Shorter day  Less energy

12. SUMMER AND WINTER SOLSTICES
Summer Solstice (June 21st)- Direct rays of the sun at 23.5 North (Tropic of Cancer), warmer and longer days in the NH, shorter and colder days in the SH
Winter Solstice (Dec 21st)- Direct rays of the sun at 23.5 South (Tropic of Capricorn), warmer and longer days in SH, shorter and colder days in the NH

13. Equinoxes
Vernal and Autumnal Equinoxes- Occurs on March 21st and September 21st. The direct rays of the sun are at equator. Moderate temps for both NH and SH

17. 3. Seasons in General
From Dec 21st to March 21st angle increases. (Height on March 21st 48)
From March 21st to June 21st angle increases. (Height on June 21st 72)
From June 21st to Sept 21st angle . Decreases. (Height on Sept 21st 48)
From Sept 21st to Dec 21st angle decreases. (height on Dec 21st 25)

18. Activity
With a partner explain in 2 to 3 paragraphs what you think would occur to the seasons if the tilt of the earth increased or decreased. Explain your reasoning.