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Wednesday 9-11-13

Wednesday 9-11-13. WU: At 7pm on August 20 th , Galveston had a high tide of 2.6m as the full moon rose. When will the next high tide be? Will there be a big or small tidal range? How do you know?. 7am (specifically 7:25am). Big.

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Wednesday 9-11-13

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  1. Wednesday 9-11-13 • WU: At 7pm on August 20th, Galveston had a high tide of 2.6m as the full moon rose. • When will the next high tide be? • Will there be a big or small tidal range?How do you know? 7am (specifically 7:25am) Big Full moon =‘s Spring Tide =‘s big difference between high and low tide.

  2. Wednesday 9-11-13 • What is the tidal range for the Spring Tide? • What is the tidal range for the Neap Tide? 3.0 meters 2.0 meters

  3. Reason for the SeasonsNotes

  4. Earth’s Rotation • Rotates (spins) on its axis every 23 hours and 56 minutes • This determines length of day • One day equals one rotation

  5. Revolution • Earth’s orbit around the Sun • Determines length of a year (365.2 days) • Earth does NOT tilt back and forth. • The axis always points to the North Star.

  6. Reasons for the Seasons • Earth’s revolution (orbit) is an ellipse. (NOT a perfect circle) • Seasons are NOT caused by how close Earth is to the Sun. • In fact, Earth is closest to the sun around January 3 and farthest away from the sun around July 4.

  7. Reason #1 • Earth’s revolution around the Sun • Draw the path of the Earth around the Sun

  8. Reasons for the Seasons? Reason #2 • Seasons are the result of the tilt of the Earth’s axis. • Earth’s axis is tilted 23.5o • The tilting is why we have seasons! • The number of daylight hours is greater for the hemisphere, or half of Earth, that is tilted toward the Sun. • When our hemisphere tilts towards the sun it is our Summer

  9. Reason #3 • The amount of direct sunlight • Direct sunlight transforms into more heat than indirect light. (90oangle is most direct) • Summer is warmer than winter in each hemisphere because the Sun’s rays hit the Earth at a more direct angle during summer than during winter

  10. Why do we have seasons? summer. • The days are much longer than the nights during the • During the winter, the Sun’s rays hit the Earth at an extreme angle and the days are very short. These effects are due to the tilt of the Earth’s axis. 140o Color the night side black 90o Write angles 180o

  11. Brain Check! Season’s ….in a nut shell! Brain Check!

  12. Hints on how to label the season…..correctly!! On each Earth: 1. Draw the EQUATOR at a right angle to the tilt 2. Draw a line over the AXIS 3. Which hemisphere receives more DIRECT sunlight? Color the night side black

  13. Explain the Seasons Between winter and summer 90o angle sun over equator Spring Summer Winter Majority of Sun is in North. Draw sun’s rays towards Earth Very Little Sun in Northern hemisphere. Draw sun’s rays towards Earth Fall Going from Summer to Winter Axis is parallel Find Summer and Winter first

  14. Solstices • Solstices occur twice a year, when the tilt of the Earth’s axis is oriented directly towards or away from the Sun.

  15. Winter Solstice North Pole is the farthest away from the Sun – due to axis (tilt) • Winter solstice in the Northern Hemisphere – shortest day of the year • Occurs on or around December 21 • Marks the beginning of winter • Remember…closest to the Sun on January 3! • Northern Hemisphere receives very little direct sunlight • Days are shorter and nights are longer since there is less direct sunlight Winter in Northern Hemisphere Summer in Southern Hemisphere

  16. Summer Solstice Due to axis (tilt) – North Pole is facing the Sun. • Summer solstice in the Northern Hemisphere – longest day of the year • Occurs on or around June 21 • Marks the beginning of Summer • Remember…farthest away from the Sun on July 4 • Northern Hemisphere receives more direct sunlight • Days are longer and nights are shorter Summer in Northern Hemisphere Winter in Southern Hemisphere

  17. Equinox • Equinox means “equal night” • A day lasts 12 hours and a night lasts 12 hours at all latitudes • The Sun is directly over the equator • Occurs twice a year

  18. Equinoxes • Vernal (spring) equinox occurs on or around March 21. • Autumnal (fall) equinox occurs on or around September 21 Axis is parallel to the direction of motion of the earth around the sun

  19. The Earth revolves around the sun

  20. Label the Solstices, Equinoxes and describe the location of Sun’s direct rays. 4 1 3 2

  21. CHECK!! • Think to yourself……what 3 things cause the seasons? • Discuss your answers with a partner. • The answers are: • The tilt – the axis is always tilted towards the Northern Star • Amount of direct sunlight received • Earth’s revolution around the sun

  22. Check out the differences in these illustrations....do you see the TILT?

  23. Birds Eye View

  24. ReviewLook closely at where the Sun is hitting the Earth during each season: 1 2 8 3 7 4 6 5 http://Search.Lycos.com/setup.asp?r=5&src=clear2&query=weather+savvy

  25. To Do:

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