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Bell Ringer: Darkness at Night Probe (Title 2 new pages “RRS”)

Bell Ringer: Darkness at Night Probe (Title 2 new pages “RRS”). Six Friends were wondering why the sky was so dark at night. This is what they said : Zane: The clouds come in at night and cover the sun. Danya : The Earth spins completely around once a day.

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Bell Ringer: Darkness at Night Probe (Title 2 new pages “RRS”)

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  1. Bell Ringer: Darkness at Night Probe (Title 2 new pages “RRS”) Six Friends were wondering why the sky was so dark at night. This is what they said: • Zane: The clouds come in at night and cover the sun. • Danya: The Earth spins completely around once a day. • Jaliyah: The sun moves around the Earth once a day. • Carlvin: The Earth moves around the Sun once a day. • Travis: The Sun moves underneath the Earth at night. • Nolea: The Sun stops shining. Which friend do you think is right? Explain your reasoning.

  2. A Day on Study Jams • 3 Quiz Questions • 2 points each • Model rotation and Revolution Discussion: As you revolved and rotated around the sun, our arms represented the earth’s axis. How would you represent the tilt of the Earth on its axis? What degree is it?

  3. Question #1 • If the rotation of the earth slowed down, what would occur? • Days would be shorter • Days would be longer • Years would be shorter • Years would be longer

  4. Question #2 • If the revolution of the Earth sped up, what would be the result? • Everyone would be younger in age • Everyone would be older in age • We would not have seasons • Seasons would be longer

  5. Question #3 • What causes seasons? • The Earth’s distance from the sun • The Earth’s rotation • The Earth’s tilt and revolution • The Earth’s tilt and rotation on it’s axis

  6. Think Pair Share • How are the two movements in space you just observed different?

  7. Rotation and Revolution K.I.M Chart

  8. Axis • An imaginary line that passes through Earth’s center and the North and South poles. • Earth’s axis is tilted at 23.5 degrees

  9. Earth’s Rotation • Rotation: The spinning motion of a planet about its axis. • Earth rotates about its axis.

  10. Stand up and Demo!

  11. Mini Lab: What does Earth’s rotation cause? • In pairs of 2, one student is the Sun and will hold a flashlight and shine it at the stomach of the other student who is Earth… • The sun (flashlight holder) stands still, while the Earth ROTATES (spins) in a circle—mimicking the motion of the Earth on its Axis. • Now imagine--- the Earth student’s belly button is a person on Earth. • When the earth (student) is facing the sun, does the person (belly button) get light? What do we call this on Earth? • When the earth (student) is facing away from the sun, would a person (belly button) get light? What do we call this on Earth?

  12. An Earth Day • It takes the Earth 24 hours to rotate once on its axis • Night and Day are caused because no light can travel through Earth. • The side facing the sun experiences day; the side facing away from the sun experiences night.

  13. Revolution • Revolution: The movement of one object around another. • Earth revolves, or moves, around the sun (heliocentric theory!)

  14. Stand up and Demo!

  15. Data:

  16. An Earth Year • One Earth Year is the amount of time it takes Earth to revolve around the sun---365.25 days (or approximately 365 days).

  17. Tell me what’s going on?

  18. Practice! • Is a ballerina spinning an example of rotation or revolution?

  19. Practice • Is this an example of rotation or revolution?

  20. Practice • Is this an example of rotation or revolution?

  21. Practice • Does the merry go round revolve or rotate?

  22. Practice • Is this an example of rotation or revolution?

  23. Practice • Is this an example of rotation or revolution?

  24. Practice • Is this an example of rotation or revolution?

  25. Practice • Is this an example of rotation or revolution?

  26. Practice • Is this an example of rotation or revolution?

  27. Think Pair Share • Around what does Earth rotate? • Around what does Earth revolve? • If Earth’s rotation slowed, what would happen to the length of a day on Earth? • If Earth revolved around the sun faster, what would happen to the length of a year on Earth?

  28. Rotation and Revolution Writing Prompt Paragraph #1: Describe how your life would change if Earth rotated every 48 hours. • How long would it be daylight? (24 hours) How long would it be nighttime? (24 hours) Paragraph #2: Describe how your life would change if it took Earth 150 days to orbit or make a revolution around the sun. • What would be affected? (age, shorter seasons)

  29. Bell Ringer: Summer Talk Probe Six friends were talking about why it is warmer in the summer than in the winter. This is what they said: • Justin: It’s because the winter clouds block the heat from the sun. • Vincent: It’s because the sun gives off more heat in the summer than in the winter. • Curi: It’s because the Earth’s tilt changes the angle of sunlight hitting the Earth. • Athziri: It’s because Earth orbits closer to the sun in the summer than in the winter. • Tadory: It’s because one side of the Earth faces the sun and the other faces away. • Aaliyah: It’s because the Northern hemisphere is closer to the sun in the summer than in the winter. Which friend do you most agree with? Write an explanation to describe your thinking and explain your reasoning.

  30. Seasons Earth’s Seasons

  31. Seasons Light Simulation Demonstration • Using a globe, Tilt earth’s axis at 23.5 degrees • Earth’s axis should be pointed to the “north star” • Revolve around the Earth at 4 locations (N, S, E, W) • What is happening to North America in each position? • Northern hemisphere is pointed towards the sun • Summer! • Neither the northern or southern hemispheres are pointed towards the sun • Fall! • Northern hemisphere is pointed away from the sun • Winter! • Neither the northern or southern hemispheres are pointed towards or away from the sun • Spring!

  32. Seasons K.I.M Chart

  33. Hemispheres • A half of a sphere.

  34. Seasons • Seasons are caused by the Earth’s tilt on its axis and its revolution (orbit) around the Sun

  35. Sunlight Intensity • Light that hits a surface directly has a higher light intensity than light that hits a surface at an angle because light that hits a surface at an angle is spread out over a larger area. • Example: Flashlight/Grid Paper

  36. What about seasons and light intensity? Sunlight hits the hemisphere that is tilted towards the sun MORE DIRECTLY. This is why the hemisphere tilted toward the sun experiences summer: the sunlight is more direct (less of an angle) and therefore it has more energy to heat the Earth!

  37. Tilting into the Summer! • If the axis is tilted towards the Sun, then it is summer in that part of the world. SUN N S

  38. CFU! • What season is it in the Southern Hemisphere? N SUN S

  39. CFU! • What season is it in the Southern Hemisphere? SUN N S

  40. The length of days Days are longer during the summer because the hemisphere is titled toward the sun – this hemisphere receives MORE sunlight. Days are shorter during the winter because the hemisphere is titled away from the sun – this hemisphere receives LESS sunlight.

  41. Solstice • Summer & Winter Solstice • Hemispheres are either receiving direct or indirect sunlight depending on the position • Direct: Axis is pointing towards sun • Indirect: Axis is pointed away from the sun

  42. Summer Solstice • First day in N. hemisphere is June 21 • Longest Day of the Year • Direct Sunlight • Sun is highest in sky • North Pole=24 hours of Light

  43. Winter Solstice • First day in N. hemisphere is December 22 • Shortest Day of Year • Indirect Sunlight • Sun is lowest in sky • North Pole= 24 hours of darkness

  44. Equinox • Vernal (Spring) & Autumnal (Fall) Equinox • When the tilt of the Earth's axis is neither towards or away from the Sun. • Sunlight strikes places the same distance north and south of the equator at the same intensity

  45. Autumnal Equinox Fall First day in N. Hemisphere is September 22. Equal Amount of Day/Night and sunlight in hemispheres

  46. Vernal Equinox Spring First day of spring in the N. Hemisphere is March 21. Equal Amount of Day/Night and sunlight in hemispheres

  47. Months of Each Season

  48. Seasons Writing Prompt • Paragraph #3: Describe how your life would change if the Earth was not tilted at 23.5 degrees. • What would change??? Paragraph #1: Describe how your life would change if Earth rotated every 48 hours. Paragraph #2: Describe how your life would change if it took Earth 150 days to orbit or make a revolution around the sun.

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