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Earth-Sun Relationships and Seasons

Earth-Sun Relationships and Seasons. http://einstein.stanford.edu/highlights/sb1-112604-earth-seasons.jpg. Earth’s Motion. Tilt of Earth’s axis = _____ degrees. (The sun’s parallel rays are at 90 degrees in one place at one time.)

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Earth-Sun Relationships and Seasons

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  1. Earth-Sun Relationships and Seasons http://einstein.stanford.edu/highlights/sb1-112604-earth-seasons.jpg

  2. Earth’s Motion • Tilt of Earth’s axis = _____ degrees. (The sun’s parallel rays are at 90 degrees in one place at one time.) • Earth’s _________ around the sun = ____ days (1 year) or about ___ degree per day • Parallelism of Earth’s axis in orbit = The Earth’s axis is always pointed toward the _____________. (Parallel to itself) • ___________ on the Earth’s axis = ___ Day (24 hours)

  3. Earth’s Rotation ________________

  4. Seasons • ________and earth’s __________cause seasons • _______intense sunlight = _____________, ___________intense = _____________ • Summer is __________because the sunlight is more __________(intense) http://www.astronomy.org/programs/seasons/pictures/07reasons-for-seasons-flashlight.gif

  5. Which rays from the sun are direct and which ones are indirect rays? Label them. What point is receiving the most Energy? Label it. What is a direct ray? ____________

  6. Summer for US is when the Northern Hemisphere is tilted ______________________. ______________________= Winter_______________for the Southern Hemisphere

  7. When is it Summer? • How can you tell if it is summer or winter for us? • When the direct rays __________the northern hemisphere, then it is __________

  8. Solstice • _______: When the sun is at its minimum or maximum height in the sky at noon • ________Solstice (Green Line): Lowest = Dec. 21st or 22nd –___________day • _______Solstice (Red Line): Highest = June 21st or 22nd __________day http://www.universetoday.com/wp-content/uploads/2009/03/seasons.jpg

  9. Sun’s Path – Notice Solstices Lines (Red & Green) color in for your notes

  10. Daylight LengthAt Winter Solstice- Dec 21 or 22 Sun is straight overhead at Tropic of _________________23.5°S Every point 66.5°S (Antarctic Circle) experiences _____ hours of daylight. Every point north of the Arctic Circle experiences 24 hours of __________

  11. Winter in Northern Hemisphere

  12. Daylight LengthAt Summer Solstice- June21 or 22 Sun is straight overhead at Tropic of ______________- 23.5°N Every point above 66.5°N (Artic Circle) experiences _______hours of daylight. Every point below 66.5°S (Antarctic Circle) experiences 24 hours ______________

  13. Summer in Northern Hemisphere

  14. Summer in Northern Hemisphere

  15. Earth’s Daylight Hours at Solstices

  16. Equinox • ___________= When the Sun’s direct rays hit the Equator. _____ hours of daylight and darkness around the world. (Equinox = ________ Daylight/Darkness) • _________(Vernal) = March 21st -22nd • ________(Autumnal) = September 22nd or 23rd • Neither Hemisphere ______ toward the sun http://www.universetoday.com/wp-content/uploads/2009/03/seasons.jpg

  17. Notice Equinox Line (Blue)color in for your notes

  18. Equinox

  19. Hours of SunlightEqual at Equinox

  20. Earth’s Orbit Around Sun • Earth is __________to sun in _________called perihelion • _______in winter because tilted _________from sun • __________in summer- called Aphelion • Warm in summer because tilted ____________ sun http://funnel.sfsu.edu/courses/gm309/labs/seasons/images/EarthsOrbitPlanView.gif

  21. Terminator Line The line that separates day from night.

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