2. The higher the sun’s angle the shorter or longer the shadow. The shadow changes throughout the day because the sun’s position is also changing. The shadow moves from west to east because the ____rises in the ____ and sets in the _____ Sun east west In the morning, the shadow starts long and gets shorter and shorter until 12—1. Then it gets longer and longer until night.

3. Earth Rotation Video http://www.youtube.com/watch?v=k-oLJxjCzBg&feature=related http://www.youtube.com/watch?v=aMxLVDuf4VY __________of earth around it’s ____ over a ____ hour time period in a ____________ direction. Rotation counterclockwise 24 axis

4. True or False: The Sun takes one day to go completely around the Earth to cause the day/night cycle. _________: Earth spins or turns around its axis. Imaginary line through the center of earth. Day for U.S. Night for U.S. Rotation Axis: Rotation around axis cause day/night cycle. Side facing the sun is in day. Rotation around axis causes day/night cycle. Side away from sun is in night.

5. Sun’s Angle vs. Daylight hrs. From June 21 to December 21, the shadow from a tree at the same time of day will A.get longer. B.get shorter. C.stay the same. From December 21 to June 21, the shadow from a tree at the same time of day will A.get longer. B.get shorter. C.stay the same. Why?The sun’s angle gets lower and lower each day Why?The sun’s angle gets higher and higher each day Suns Position Video: http://www.youtube.com/watch?v=zkkuoJkyrwo

6. What date is the sun at its lowest angle ? What date will have the shortest amount of daylight hours? What date is the sun at its highest angle ? What date will have the longest amount of daylight hours? How do the Sun’s position in the sky and length of daylight relate to the seasons of the year? smallest angle, shorter daylight hours =ColderWinter – Summer–highest angle, longer daylight hours = Warmer Dec. 21 June 21 Sun’s Motion Website http://astro.unl.edu/naap/motion3/animations/sunmotions.swf

7. Revolve – Orbit – Revolution- Movement of a planet around the sun Elliptical path the planet follows-almost a perfect circle One complete orbit Counterclockwise direction 365 1/4 days Seasons website http://astro.unl.edu/naap/motion1/anim ations/seasons_ecliptic.html True or False: Distance from the sun determines Earth’s seasons. On average Earth is approximately ____________ km from the Sun. 150,000,000 In the winter we are closer to the Sun than in the summer. There is not a significant change in the distance throughout Earth’s orbit. Northern and Southern Hemisphere have opposite seasons, if distance determined seasons, they would share the same season.

8. Seasons Video: http://www.youtube.com/watch?v=WLRA87TKXLM &feature=related Light video http://www.youtube.com/watch?v=eUsWUiVCq5U Season's video http://www.youtube.com/watch?v=Pgq0LThW7QA

9. Label/Draw- for northern hemisphere orbital path with revolution direction axis with degree tilt winter and summer solstice with date autumn (fall) and spring equinox with date on orbital path label the 4 seasons: winter spring summer autumn(fall) rotation of earth Winter Solstice Dec. 21/22 Spring Equinox March 21/22 Summer Solstice June 21/22 Autumn Equinox Sept. 21/22 23.5 0 Winter Spring Summer Autumn (fall)

10. indirect sun light direct sun light indirect sun light Same amount of light energy is spread over a larger area - less energy per area. Same amount of light energy is spread over a smaller area – more energy per area. Direct and Indirect Light Video: http://www.youtube.com/watch?feat ure=endscreen&NR=1&v=risM55KG2 h8

12. Label/Draw tilt with axis equator tropics northern and southern hemisphere winter and summer for each hemisphere direct and indirect sunlight Northern Hemisphere Southern Hemisphere Northern Hemisphere Direct sunlight Indirect sunlight Direct sunlight Winter Summe r Indirect sunlight Direct sunlight 23.5 0

13. Earths Season’s are determined by Earth’s ____________ and _____________. True or False: If Earth did not have a tilt we would not have seasons. Season Video: http://www.youtube.com/watch?v=FBhTRoajVfc revolution tilt