|Name of Activity||Orbits of the Earth, Moon, and Sun|
|Author||Michael Hart, Usula Deelstra|
|Keywords||earth, moon, sun, models, rotation, tilt, relative size, seasons, stars, size, motion|
|Grade Level||K, 1, 2, 3, 4, 5, 6|
|Time||1 Hour Total|
|Brief Description||The class will explore the relation between the Earth, moon, and sun using classroom models.|
|Lesson Objectives:||The Purpose of this activity is to discuss how the Earth, moon, and sun move relative to each other. And to discuss rotation, tilt, and relative size. In regards to relative size, a physical activity is introduced to help enhance the concept of the relation of the Earth, moon, and sun to each other.|
|Materials Needed:||- Balloons.
- Tape Measure.
|Necessary Background||This activity deals with the orbit of the earth around the sun and the orbit of the moon around the earth. It takes the earth one year (365 days) to orbit the sun. At the same time, the earth is rotating about its own axis. The earth makes one complete rotation once a day. The combination of the rotation of the earth, its orbit about the sun, and the earth’s natural tilt cause seasons on the earth. For a more detailed description see http://www.windows.ucar.edu/tour/link=/the_universe/uts/earth3.html. This website contains information about the earth’s orbit, its rotation, and the seasons. Similar to the earth, the moon has an orbit and rotation also. A description of the moon can be found at http://www.windows.ucar.edu/tour/link=/the_universe/uts/moon1.html.