1. MOTIONS OF EARTH, MOON AND SUN

2. Motions
movements

3. APPARENT MOTION
Motion that an object appears to make

5. 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

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

11. Star Motion at Middle Latitudes

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

13. 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

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

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

24. Sun rotates revolves rotates revolves
Heliocentric Model
_____ is at center of solar system
Earth ________ on its axis and _________ around Sun.
Moon _______ on its
axis and _________
around Earth.
Sun
rotates
revolves
rotates
revolves
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25. Which of the two models do we believe today?
HELIOCENTRIC MODEL

26. Actual Earth Motions Milky Way expanding Solar System 225 Rotates
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

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

28. Evidence of Earth’s rotation
Foucault pendulum

31. 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

36. 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

37. 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

41. Earth Motions and Time rotation LONGITUDE
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