1. Sun-Earth System Investigation 3, Part 2
Seasons and Sun
Sun-Earth System
Investigation 3, Part 2
TG-P.97-98

2. Review
Review the following questions from Wendy and Her Worldwide Weather Watchers
When one location on Earth has 14 hours of daylight, is all the rest of the world having 14 hours of daylight as well?
Is the longest day of the year the same length all over the world?
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3. Review
Is the shortest day of the year the same day all over the world?
Are the longest days always in the summer?
Are the shortest days always in the winter?
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4. What ideas do you have to explain why daylight hours change over a year?
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5. Earth-Sun Construction Challenge
What causes seasons?
As a class, decide how the globes should be placed to represent the seasons.
Use Socratic Seminar techniques to debate the placement of the planets.
Only one person speaking at a time
Can change your mind
Should question self and other students

6. Building Background Watch Earth, Moon, and Sun video(10 min.)
Listen and watch actively in order to complete the responses accurately

7. Sun-Earth Model
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8. Revolution The movement of one object around another
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Takes days or 1 year
The Earth revolves around the Sun

9. Rotation The Earth turning on its axis
One turn on it axis takes 1 day or 24 hours
Earth has a North and South Pole
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Axis is the imaginary line that if you connect the North and South Pole
The axis is tipped over at an angle of 23.5˚ with +/- 1º variation

10. Rotation
How do we know where it is day and where it is night on this globe?
Day
Night
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How much of the globe is in daylight at any given time?
Always exactly half illuminated and half dark

11. North Star (called Polaris)
Always positioned directly over Earth’s North Pole
Used as a navigation aid to seafarers and explorers for centuries
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12. Summary
Is there a part of Earth that experiences only daylight or only darkness during the year?
Above the Arctic Circle
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Below the Antarctic Circle

13. Equinox Two days during the year that day and night hours are equal
Comes from Latin meaning “equal night”
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14. Fall Equinox Spring Equinox Autumnal equinox
occurs around September 21
Fall Equinox
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Vernal equinox
occurs around March 21
Spring Equinox

15. Longest Day in the Northern Hemisphere?
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Which way is the North Pole tilted?
Toward the Sun

16. Solstices Summer Solstice Winter Solstice Around June 21
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Winter Solstice
Around June 21
The longest day of the year
Solstice means “sun stands still”
Around December 21
The shortest day of the year

17. Sun is directly over the equator Day and night are equal
At spring equinox
Sun is directly over the equator
Day and night are equal
At fall equinox
North Pole is tilted neither toward nor away from the Sun
Sun is directly over the equator
Half in daylight and half in darkness
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At summer solstice
North Pole is tilted toward the Sun
Northern Hemisphere receives more sunlight
At summer solstice
North Pole is tilted toward the Sun
Northern Hemisphere receives more sunlight
At summer solstice
North Pole is tilted toward the Sun
Northern Hemisphere receives more sunlight
At winter solstice
North Pole is now tilted away from the Sun
Shortest day of the year

18. Seasons At fall equinox Days are getting shorter
Less exposure to light, lower temperatures
At winter solstice
Days are shortest
Less exposure to light, lower temperatures
Snow, ice, frost, etc
Seasons
At summer solstice
Days are longer
Longer exposure to light produces the effects of summer
Warmer temperatures, plant growth
At spring equinox
Days are getting longer
Exposure to light is increasing, raising temperatures
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19. Reading
Read “Seasons” starting on page 17 of your green resource book.
Respond to your reading with the following chart on the back of lab sheet.
Vocabulary:
Record bolded terms here. There are 10.
Pick and choose:
Choose four terms to draw a picture of. Label each.
Chart:
Explain what the chart on page19 represents. Describe all the elements of the chart. Tell why the chart is important.
Numerical Facts:
Write a bullet point of 10 facts that includes a numerical value. These statements should
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Student Resource Book P.17-19

20. Multimedia “Seasonal Changes” lab sheet
Use the FOSS Web animation for seasons under cycles tab to aid in the completion of your work.
The questions can become difficult if you do not make careful observations and concentrate on your task at hand.
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21. Response Sheet
After you finish the Multimedia, turn to pg 11 in your Lab Notebook – Seasons and Sun
Complete the assignment independently or through thoughtful discussion with shoulder partner. Never just telling.
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Student Lab Notebooks P.11
TG -Teacher Assessment Master p. 383/p. 426