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9 - 9:00Astronomy Chapter2Lessondue4/5at11:55pm...

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9:00 Astronomy  13:14 Chapter 2 Lesson due 4/5 at 11:55pm Naked-eye Astronomy Motions of the Sun and Moon o Why do they and how do they move in the sky? The earth spins on its axis once per sidereal day Different stars are at different distances from us o Convenient Fiction The earth is stationary The stars are all at the same distance -- a celestial sphere The celestial sphere rotated around us once per sidereal day o In reality The earth orbits the sun once per year 23  ½  angle between earth’s equator and the plane of its orbit It rotates on a tilt makes up for seasons Path of the sun is called ecliptic Moon cycle is 27.32 days But to see a new moon it is 29.53 days Synodic month o Lunar eclipse When we block out the moon o Solar eclipse When the moon casts a shadow on earth Not always on the same axis*
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9:00 Astronomy 13:14 Naked-eye Astronomy Motions of the planets o How and why Motion of the planets Planet means wonderer Planets rise in the east, set in the west Relative to the stars, the planets slowly change their position o Mostly move to the east (like the sun – direct motion) o But sometimes to the west (retrograde motion) o and always close to the ecliptic o Ancient Greeks explained retrograde motion by one circle, a larger one  that surrounds the earth, and another planet stuck on it, deferent, and the  center of the other planet’s cycle was hooked on and rotates with it,  epicycle Look up image* Heliocentric Model (Copernicus) o
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