Advanced Physics Lab
1689100-31750Movement in the Heavens00Movement in the Heavens Seed Question: When you look up into a beautiful starry sky, what is the apparent shape of the heavens? Imagine you are lying on your back, far from city lights with an unobstructed view of the sky for hours. Where does this shape come from?Exploration: What would an infinite, flat sky look like to a person standing on a flat Earth? Sketch it! What do the stars overhead look like? How about on the horizon?Look up at the acoustic ceiling tiles and imagine they went on forever. Let the little black squiggles be stars…Well, that’s not what the universe looks like!What are the apparent daily motions of the Sun, Moon and stars? See the SkyChartIII daily simulation. They all appear to rise in the ________, move across the sky in a giant arc and set in the _________. What is the apparent annual motion of the Sun against the stars? In other words, if you could see the Sun against the starry background which direction would the Sun move in, over the course of a year? See the SkyChartIII annual simulation. The Sun would move toward the ________, along the ecliptic.-62992016319588Big Idea: Imagine a fixed spherical Earth centered on the inside of a much larger, giant Celestial Sphere that rotates daily on its axis. Tape in the Celestial SphereGraphic.-22225100330LibraLeoCancer10h ScorpiusVirgoPolaris (North Star)SUNEARTHPeriod of Rotation of Celestial Sphere is 23 h 56 mPeriod of Rotation of Solar Sphere is 1 year: (1 degree to the east each day )0o2h 4h 6h 22h 20h 18h 12h 14h 16h 8h 23.5o tilt +30o +60o +90o (North Celestial Pole)0hAquariusPiscesTaurusGeminiSagittariusCapricornus-30o-60o-90oCelestial EquatorThe Celestial Sphere Ptolemaic System (150 AD) EclipticAriesDeclinationRight Ascension 0LibraLeoCancer10h ScorpiusVirgoPolaris (North Star)SUNEARTHPeriod of Rotation of Celestial Sphere is 23 h 56 mPeriod of Rotation of Solar Sphere is 1 year: (1 degree to the east each day )0o2h 4h 6h 22h 20h 18h 12h 14h 16h 8h 23.5o tilt +30o +60o +90o (North Celestial Pole)0hAquariusPiscesTaurusGeminiSagittariusCapricornus-30o-60o-90oCelestial EquatorThe Celestial Sphere Ptolemaic System (150 AD) EclipticAriesDeclinationRight Ascension Each day the Sun, Moon and stars all appear to rise in the east and set in the west. Over the course of a year, the Sun appears to drift eastward relative to the stars which are fixed to the Celestial Sphere. Discussion: ? ................
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