1. Tilt of the Earth
What is the difference between rotation and revolution ?
What causes the earth’s seasons ?
What is the position of earth during each season?
How does Earth’s tilt cause temperature differences in the seasons ?

2. Rotation vs. Revolution
The Earth REVOLVES (revolution) around the sun
REVOLUTION means to “move around an object”
One revolution takes approximately 365 days ( 1 year)
The Earth ROTATES on its axis
ROTATION mean to “spin”
An axis is an imaginary line that goes through the center of the planet
The earth is TILTED 23.5° from the vertical position of the axis

3. What causes the Earth’s Seasons ?
The earth is divided by the equator into two halves called hemispheres ( North and South)
The seasons are not the same on all parts of earth at the same time (when it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere)
Earth’s revolution + (plus) the way the Earth tilts on its axis causes the seasons.
The sun’s rays strike Earth unevenly – at different angles at different times of the year.

4. OPENING: 10/5/18 1. Write homework in Agenda.
2. Work on TIERED TASKS AND THEN TURN IN.
*YOU HAVE 10 MINUTES.

5. Position of Earth
When the Northern Hemisphere tilts towards the sun = summer.
At the same time, its winter in the Southern Hemisphere
When the Northern Hemisphere tilts away from the sun = winter.
At the same time, its summer in the Southern Hemisphere
Summer in Northern Hemisphere, Winter in Southern Hemisphere
Winter in Northern Hemisphere, Summer in Southern Hemisphere
Fall in Northern Hemisphere, Spring in Southern Hemisphere
Spring in Northern Hemisphere, Fall in Southern Hemisphere
The seasons are always opposite in Earth’s Northern and Southern Hemispheres.

6. Temperature and Daylight
The sun’s rays deliver the most energy when Direct
When its Summer in an area, the sunlight is More directly
The area receives Direct Energy from the sun
During Winter, certain areas receive the sun’s rays at an angle
When its Winter in an area, the sunlight is Less direct
The area receives energy from the sun at an angle

7. The Causes of the Different Seasons
The sun’s rays strike Earth unevenly- at different angles at different times of the year
Near the equator, the sun’s rays hit DIRECTLY
AT the poles, the sun’s rays hit AT AN ANGLE

8. Temperature and Daylight
The amount of daylight also changes with the seasons.
Summer= more hours of daylight, so the sun heats Earth’s surface longer ( temperatures higher)
Winter = less hours of daylight, so the sun heats Earth’s surface for a shorter amount of time ( temperatures lower)
In the Northern Hemisphere, from Dec. 21st to June 21st the period of daylight gets longer, from June 21 to Dec. 21st, the period of daylight gets shorter
Many parts of the earth do not have distinct seasons
Places near the equator receive direct sunlight all year long, so temperatures remain high
The north and south poles get less direct sunlight from farther poles, so even in summer, these places are still cold

9. Again- The Seasons