Daily Objective: Students will be able to explain the relationship between daylight length and the angle of the sun in the sky and also relate this data to the seasons. Materials needed: Science notebook Colored pencils Absent last week during the quiz? See Mr. Kahn. Agenda Revolution pre-test 2nd attempt Sunlight and the seasons activity Bill Nye Seasons if we have time Learning goal: I will be able to explain how Earth’s revolution causes a year, tidal changes, seasons, and constellation changes.

Astronomy Pretest #1 Revolution What do you already know…

1. Why does earth experience seasons? The tilt of the axis The length of rotation The length of revolution The speed at which we spin

2. How many days are there in a year on earth?

3. Draw me an example of how the sun contributes to creating the tides.

4. When is the Earth closest to the sun?

5. Cygnus is a winter constellation. Can you see Cygnus in the summer?

6. The moon has 8 main phases. This is caused by the reaction of sunlight and shadows as earth revolves around the moon. The shadow on the moon is what makes it look like the moon is changing shapes. What is wrong with that section?

7. What force keeps the moon in its orbit around the earth?

8. What is an equinox?

9. What is a solstice?

SCALE 9/9 = 3 7-8/9 = 2 5-6 = 1 4 or less/9 = 0

Geocentric and Heliocentric Theories Geocentric – Earth is the center of the universe Heliocentric – Sun is the center of the SOLAR SYSTEM

Open to page F-23 (Activity 75) What do you think caused the changes Tyler observed in the tree’s shadow?

Talk with your shoulder partner Why do you think the Earth experiences seasons? What is the imaginary line that separates the Northern and Southern Hemispheres?

Earth’s tilt Earth is almost always tilted 23.5 degrees while it revolves around the sun.

Equinox (March 21 and September 21) Earth tilts neither towards or away from the sun. Daylight and night are 12 hours each.

Solar and Lunar Eclipses

Spring and Neap Tide Spring Tide – Water rises and falls more than usual Neap Tide – Water rises and falls less than usual

Let’s look at Tables 1 & 2 (page F-25) Do you see a pattern in the sunrise times throughout the year? Time of sunset? Length of daylight? Angle of the sun?

Work in partners to graph data One partner graphs for 2005 and the other 2006. Use one color for “daylight hours” and another color for “sun’s highest angle”. After graphing data, place the graphs next to one another to see if they are similar. Answer analysis questions on page F-26.

iClass Discussion Question Name 3 points of President Trump’s inauguration speech