Do Now In order, list the Terrestrial & Jovian planets of our solar system. What are the major differences between these two categories of planets? 2. During which months do you think the following pictures were taken? (A) (B) 3. If an object is closer to the sun, will it have a higher or lower temperature?

OBJECTIVE evaluate how planetary motion leads to season changes.

QUOTE OF THE DAY      “Nobody can go back and start a new beginning, but anyone can start today and make a new ending.” ~Maria Robinson

VIDEO 1. What are the four seasons. 2 VIDEO 1. What are the four seasons? 2. What 2 factors cause the seasons to occur? 3. Does the tilt of the Earth change as it rotates around the sun? 4. At the same time of year what seasons will the northern and southern hemispheres experience? http://player.discoveryeducation.com/index.cfm?guidAssetId=701675E3-565C-423E-AE7D-20E4AF5D17C7&blnFromSearch=1&productcode=DSCE

DAY NIGHT The Earth rotates on its axis 1 full rotation = one day Looking at the picture below, why is the left hemisphere experiencing a warm day and the right hemisphere experiencing a cooler night? DAY warmer NIGHT cooler Comparing Rotations: Earth=24 hrs Mercury=59 days Pluto=6 days

The Earth orbits (revolves around) the sun How long is one full revolution? 365 days = 1 year Comparing Revolutions: Earth=365.25 days Mercury=88 days Oluto=248 years

The planet…What do we know? All the planets in our solar system revolve around the sun. But how? Kepler discovered elliptical planetary orbits A B C

So this is what the Earth looks like right? axis

And it revolves around the sun like this right? This shows orbit

This shows orbit WRONG!

Earth’s axis is not straight Earth’s axis is tilted 23.5° from vertical 23.5° tilt

The Earth’s orbit actually looks like this This shows orbit

Like What? http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm?chapter_no=visualization

The Earth’s tilted axis allows us to have seasons Why does that matter? The Earth’s tilted axis allows us to have seasons 4 seasons based on Earth’s position to the sun Spring Summer Fall Winter

Radiation (high/neutral/ low) Tilt (towards/ neutral/away) Radiation (high/neutral/ low) Temperature (warm/ moderate/ cool) Season

Top tilted away from sun= winter When the Earth is tilted away from the sun. Coldest temperatures Top tilted away from sun= winter

Beginning to be tilted toward the sun= spring Moderate (medium) temperatures Starts cold and gets warmer as that part of Earth is tilted toward the sun Beginning to be tilted toward the sun= spring

Top titled toward the sun= summer When the Earth is tilted toward the sun. Warmest temperatures Top titled toward the sun= summer

Beginning to be tilted away from the sun= spring Autumn (fall) Moderate (medium) temperatures Starts warm and gets cooler as that part of Earth is tilted away from the sun Beginning to be tilted away from the sun= spring

The equator divides the earth into top and bottom halves (Northern and Southern hemisphere) Because of the tilt of the earth, the hemispheres have opposite seasons.

FOLDABLE FRONT INSIDE BACK SUMMER AUTUMN SPRING WINTER DRAWING DRAWING DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION BACK Draw a picture to show the Earth orbiting around the sun. Draw the Earth in the 4 main positions. Use arrows to show the direction the Earth is moving. On your arrows, describe what the temperature is doing. Label the four seasons. DRAWING DRAWING DRAWING DRAWING DESCRIPTION

POSTCARD Pick a place on the map you will travel to over the summer. Write a postcard telling your friend what season it is there. Explain why it is that season. Describe what the temperature is like. For the picture on your postcard (on the back), draw what the Earth and sun would look like for this season. 1 2 3 4 Alaska South Africa Brazil England

EXIT TICKET When the northern hemisphere is experiencing fall, which season is the southern hemisphere experiencing? Summer b. Fall c. Winter d. Spring The rotation of the earth on its axis is responsible for what time frame? An hour b. a day c. a season d. a year Who was credited with discovering the elliptical planetary orbit? a. Galileo b. Einstein c. Kepler d. Wegner What is the measure of the tilt of Earth’s axis? a. 5o b. 23.5o c. 75.3o d. 90.5o 5. What does Earth’s revolution refer to? Movement around its axis b. Movement around sun c. It’s formation of day d. Rotation around other planets