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Earth In Space

Earth In Space. Mr. Ahearn Earth Science 2010. Motions of Celestial Objects. Celestial Sphere- Imaginary sphere encircling Earth on which all objects in night sky appear. Motions of Celestial Objects. Celestial objects appear to move circular or curved paths (east-west 15*/hr)

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Earth In Space

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  1. Earth In Space Mr. Ahearn Earth Science 2010

  2. Motions of Celestial Objects • Celestial Sphere- Imaginary sphere encircling Earth on which all objects in night sky appear.

  3. Motions of Celestial Objects • Celestial objects appear to move circular or curved paths (east-west 15*/hr) • Sun, moon, planet, stars

  4. Stars overhead @ equator follow same path as sun. Stars in southern hemisphere may only be visible briefly (below celestial equator) Northern hemisphere move in circles around Polaris (15*/hr.) Star Paths

  5. Path of Planets • Word planet means “wanderer” • Move 15*/hr. plus each has own characteristic motion. • Retrograde motion

  6. Path of Planets

  7. Constellations • Apparent patterns people use to mark star positions

  8. Models of the Night Sky • Geocentric: Earth-centered • Heliocentric: Sun-centered

  9. Evidence for Heliocentric • Foucault Pendulum • Coriolis Effect

  10. Complete Review BookQuestions #1-16

  11. Apparent Motions Of The Sun • Time is based off of sun’s motion

  12. Seasons Northern Hemisphere -sun highest in sky June 21 (summer solstice) -sun lowest in sky December 21 (winter solstice) - Sept.22 (vernal equinox) -March 21(vernal equinox)

  13. Latitude and Angle of the Sun • Path of sun depends on your position • Sun is never directly over head in the Continental USA • Can be directly overhead in the tropics (23.5 N to 23.5 S) • Arctic and Antarctic first day of summer sun never sets, first day of winter sun never rises

  14. Hours of Daylight • At equinoxes daylight last 12hrs (except @ poles. • At equator 12 hrs of day and nights yr. round

  15. Summer Solstice Winter Solstice

  16. Equinox

  17. Answer Questions #17-45 Review Book p.260

  18. The End See you in outer space!

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