Revolution 3/3/17
DO NOW HW on Desk! 1. What is the earth s axis? 2. How long does it take the earth to rotate once on its axis? 3. What are the three different types of galaxies? In what type of galaxy is our solar system located? 4. What is the difference between the heliocentric and geocentric theories? Which theory correctly describes our solar system?
Observations Both pictures show how the Earth moves what is different about how the earth is moving?
Remember Earth ROTATES on its axis It takes earth 24 hours (one day) to do this The side facing the sun experiences day; the side facing away from the sun experiences night. http://www.youtube.com/watch?v=y6y2zm3thdi&safety_mod e=true&persist_safety_mode=1
Check for Understanding 1. It takes 24 hours for earth to rotate on its axis. This is how we time ONE DAY. HOW WOULD the LENGTH of the day change if the earth moved more slowly on its axis? What if the earth moved more quickly?
Revolution Revolution: The movement of one object around another. Earth revolves, (moves, around) the sun. It takes 365 days to do this.
Earth Revolves around the Sun in its orbit
Demo Stand and demo: Revolution vs. Rotation Think of your own! In your guided practice, jot down some notes about Is the skater in the first video revolving or rotating? Explain why. https://www.youtube.com/watch?v=0ostqg4knma Are the athletes in the second video revolving or rotating? Explain why. http://www.youtube.com/watch?v=iqioyvqpd3i&feature=r elmfu (start video at 4:30)
If one ROTATION causes day and night, what does one REVOLUTION cause? 1 Earth Year = 1 Revolution around the sun That 1 Revolution causes the Seasons!
The Seasons - Demo Earth is tilted on its axis As the Earth moves around the sun different areas are closer to the sun s heat That is why we get different weather at different times of the year This is also why you have opposite weather North and South of the equator. The part of the earth that is closest to the run is experiencing summer CFU: What season is it where the red star is in the earth above??
What do you notice about how the earth is moving? http://www.classzone.com/books/earth_scien ce/terc/content/visualizations/es0408/es0408 page01.cfm Both movements happen at the same time!
Check for Understanding 1. It takes 365 days for earth to revolve around the sun. This is how we time ONE YEAR HOW WOULD the LENGTH of the year change if the earth moved more slowly around the sun? What if the earth moved more quickly?
Simon Says.Revolution or Rotation? Stand silently and push chair in. Follow the rules for Simon Says You will have to either rotate or revolve. Mixed them up?! Must sit down until the next round.
Summarizing Earth s Revolution and Rotation Definition How long does it take? What does it cause? Revolution of the Earth Earth orbiting around the SUN Rotation of the Earth Earth spinning on its axis (imaginary line going down the center) 365 days (1 year) 24 hours (1 day) Winter, Fall, Spring, Summer (depending on the earths tilt and position around the sun) Day and Night (depending on which side of the earth is facing the sun)
Simon Says.Revolution or Rotation? Stand silently and push chair in. Follow the rules for Simon Says You will have to either rotate or revolve. Mixed them up?! Must sit down until the next round.
Practice! Is a ballerina spinning an example of rotation or revolution?
Practice Is this an example of rotation or revolution?
Is this an example of rotation or revolution? Practice
Does the merry go round revolve or rotate? Practice
Is this an example of rotation or revolution? Practice
Is this an example of rotation or revolution? Practice
Is this an example of rotation or revolution? Practice
Is this an example of rotation or revolution? Practice
Is this an example of rotation or revolution? Practice
Questions for Review 1. Around what does Earth rotate? 2. Around what does Earth revolve? 3. If Earth s rotation slowed, what would happen to the length of a day on Earth? 4. If Earth revolved around the sun faster, what would happen to the length of a year on Earth?
Last 5 Review It Exit Ticket Clean Up Pack Up Line Up