Investigation 3, Part 2

1. Investigation 3, Part 2 Day and Night with Globes

2. Warm up: • Why do we experience day and night on Earth? • The Earth spins on it’s axis once every 24 hours. Half of the Earth is in light and half is in dark at all times.

3. Day and Night with Globes • One person from each group, get a globe. • What direction does the Earth move? • Counterclockwise. • Show me. • Where does sunrise occur first? In the East or the West?

4. Move your Globes to Show: • Your location on the globe is Phoenix. • Show me: • Day • Night • Noon • Midnight • Sunrise • Sunset • Now we will look at this with a large globe.

5. Questions: • 1. Why is it dark at night? • Because the sun in not shining on us. • 2. At any given time, how much of the Earth is in day and how much in night? • Half • 3. What makes the sun “go up” and “come down?” • The movement of the Earth as it spins on it’s axis. • 4. Does the sun come up in the morning all over the world? • Yes, but at different times. • Revisit these questions in your journal from yesterday. Make any changes you need to. You have 5 minutes. • Discuss with your peers. Do you agree?

6. Review Simulation Again • http://www.youtube.com/watch?v=k-oLJxjCzBg

7. Key Points • The sun is a luminous object that gives off light and illuminates Earth each day. • When light falls on an opaque (not able to be seen through object) object, the portion in the path is illuminated. The area behind the object is in the shadow, in the dark. • When light falls on a spherical object, like a planet, exactly half is in light and half in dark

8. Key Points: • Day/night are the names we give the dark/light portions of the Earth. • From our position on Earth, it looks like the Sun circles the Earth once every day, but in reality the Sun is stationary (for the most part) and Earth rotates on it’s axis once every day, giving the illusion that the Sun rises and sets. • http://www.youtube.com/watch?v=taHTA7S_JGk