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MOTIONS OF EARTH, MOON AND SUN

MOTIONS OF EARTH, MOON AND SUN. Motions. movements. APPARENT MOTION. Motion that an object appears to make. Daily motion and stars:. circular. Paths of all stars appear to be ______ or parts of a _____ called an ___. Rise in the _____ and set in the _____

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MOTIONS OF EARTH, MOON AND SUN

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  1. MOTIONS OF EARTH, MOON AND SUN

  2. Motions • movements

  3. APPARENT MOTION • Motion that an object appears to make

  4. Daily motion and stars: circular • Paths of all stars appear to be ______ or parts of a _____ called an ___. • Rise in the _____ and set in the _____ • Motion occurs at rate of ___________ (360 in 24 hours) • ______ remains stationary in the center . circle arc East West 15o per hour Polaris

  5. **this apparent motion is because the Earth ROTATES!

  6. Star Motion at Middle Latitudes

  7. Apparent Motions of Earth’s Moon: • Same motion as the stars: rises in the ____ and sets in the _____. East West

  8. Apparent motions of the Sun: • Path from sunrise to sunset has the shape of an ___. • Path changes in two ways throughout the seasons: • Length • Position in the sky • Reaches highest point in sky at this time of day: __________. arc Solar Noon

  9. 23.5oN 23.5oS • Can only be directly overhead (90) between ______ and ______. • Is the Sun ever directly overhead in New York State? NEVER!!

  10. Models that Explain Apparent Celestial Motions: • Geocentric model: Earth doesn't move and most celestial objects revolve around it

  11. Sun rotates revolves • Heliocentric Model • _____ is at center of solar system • Earth ________ on its axis and _________ around Sun. • Moon _______ on its axis and _________ around Earth. rotates revolves

  12. Which of the two models do we believe today? HELIOCENTRIC MODEL

  13. Actual Earth Motions • Moves with our galaxy, called the _________ as the Universe is _________. • ____________ revolves around center of Milky Way (it takes ____ million yrs.) • _______ on its axis and _______ around Sun in an orbit, whose shape is an ______. Milky Way expanding Solar System 225 Rotates revolves ellipse

  14. Rotation of Earth axis • Earth spins on its ______. • Its’ axis is tilted at _____. • Earth rotates at a rate of ____________. 23.5° 15° per hour

  15. Evidence of Earth’s rotation • Foucault pendulum

  16. Evidence of Earth’s rotation (ctd) • Coriolis effect • All objects moving at Earth’s surface are ____________________________________. • Deflection appears to the ______ in the Northern Hemisphere deflected from a straight line path right

  17. Revolution of the Earth • Revolves around sun in a slightly ________ orbit. • Revolves at a rate of about ___________. • How many degrees in a circle? • How many days in a year? elliptical 1o per day 360o 365 days 360o 365 days

  18. Evidence of Earth’s revolution around the Sun: • Different ___________ are visible during different times of the ____. • Apparent size of ____ changes as earth is ______ or ______ away constellations year Sun closer further

  19. Earth Motions and Time rotation • Time is based on Earth’s _______ on its axis. • ALL PLACES ON THE SAME LINE OF ____________ HAVE THE SAME TIME • Time zones: • keep time the same for regions LONGITUDE

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