Earth, Sun, and Moon

Do Now If the Earth has revolved exactly once around the Sun since the last time that you went to the zoo, how much time has passed? One month Ten years One day One year What defines one year on Earth? The time Earth takes to complete 365 revolutions. The time the moon takes to complete one revolution around the Earth. The time Earth takes to complete one rotation. The time Earth takes to complete one revolution. 4 minutes

Objective Objective: At the end of today’s lesson, I will be able to explain how the tilt and movement of the Earth cause the seasons.

Which hemisphere is experiencing summer in this picture Which hemisphere is experiencing summer in this picture? Which hemisphere is experiencing winter in this picture?

SWBAT define equinox, solstice, hemisphere, season, and North + South Pole. SWBAT locate the hemispheres, poles, and the equator

I. Seasons The four seasons are caused by the tilt of the Earth as the planet revolves around the sun. This tilt makes sunlight hit the Northern and Southern Hemispheres at different angles, which causes the changes in temperature and amount of daylight that define the seasons. The more direct sunlight a hemisphere is receiving, the warmer the temperatures and the longer the days

II. Equinox Twice a year we have an equinox, where both the Northern and Southern hemispheres are at the same tilt from the Sun, and both receive the same amount of sunlight. In the Northern Hemisphere, the vernal equinox is around March 22, and the autumnal equinox is around September 22. When it’s the vernal equinox in the Northern Hemisphere, it’s the autumnal equinox in the Southern Hemisphere.

d. During an equinox, the sun looks like its moving directly over the Equator. e. Every place on Earth (except the poles) gets 12 hours of day and 12 hours of night.

III. Solstice a. The summer solstice is when we have the longest day of all in terms of sunlight. b. This occurs around June 21 and marks the start of summer c. As the Earth’s revolution continues and we get less and daylight until we reach the winter solstice, the shortest day of the year. d. This occurs around December 21and marks the start of winter

IV. Hemispheres, Poles, and the Equator The hemispheres are the halves into which the Earth is divided. The equator is the line halfway between the North and South poles that divides the Earth into the Northern and Southern hemispheres.

IV. Hemispheres, Poles, and the Equator The North Pole is the northernmost point of the globe, and the South Pole is the southernmost point of the globe.

Equator Northern Hemisphere Southern Hemisphere Today we are going to draw and write about the seasons. Draw a picture that shows why we have seasons. Make it big. Use the back of your instructions paper. Label all of the words in the word bank on your picture. Use the picture below as a starting point. Make sure it is neat and clear. You have 5 minutes Axis Revolution Tilt Equator Northern Hemisphere Southern Hemisphere Summer Winter Sun Earth

Brainstorming What do we know about these words? Axis Revolution Tilt Equator Northern Hemisphere Southern Hemisphere  Summer Winter Sun Earth

Brainstorming What do we know about these words? Axis: The line that goes through the center of the Earth. Revolution: The Earth rotates around the sun. Tilt: The Earth is tilted, which causes the seasons. Equator: The equator splits Earth into two hemispheres Northern Hemisphere: The Northern Hemisphere is the north part of Earth Southern Hemisphere: The Southern Hemisphere is the south part of Earth Summer: It is summer in the NH when the Northern hemisphere is tilted towards the sun Winter: It is winter in the NH when the Northern hemisphere is tilted away from the sun Sun: The source of our heat; what the Earth revolves around. Earth: Our planet!

Writing Using the terms we brainstormed with, write a paragraph about why we have seasons. Use all of the words and grade it using the rubric on your paper. You have 15 minutes