What s going on during a solar eclipse. Solar Eclipses. Total Solar Eclipse on March 29, 2006 (viewed from Turkey) Partial, Total, and Annular
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1 Solar Eclipses The Sun disappears behind the Moon The Moon is always in the New phase during a solar eclipse Can only be seen from certain places on Earth These events are even more rare than lunar eclipses Next solar eclipse is Feb. 26, but only visible from South America, Africa, and parts of Antarctica Next one visible from the USA is in August 2017 (total!) What s going on during a solar eclipse Partial, Total, and Annular Total Solar Eclipse on March 29, 2006 (viewed from Turkey) Partial: Takes out a bite Total: Covers the Sun Moon slightly closer Annular: Leaves a ring Moon slightly farther away This occurs when sunlight shines through a dip (usually a crater or valley) on the edge of the Moon s disk Diamond Ring Effect Geocentric vs. Heliocentric Models of the Universe geocentric (Earth-centered) heliocentric (Sun-centered) 1
2 9/16/16 Ancient Greek Universe North Star Celestial Sphere How the Greeks modeled the heavens Axis of Rotation Earliest mostly complete recorded attempt to explain the heavens without supernatural sources Philosophical Ideas The heavens represent perfection. All heavenly bodies are perfectly formed. Spherical Unblemished The heavens are unchanging. The circle is the perfect shape. All heavenly motions must be circular. Ancient Greek Model stars reside on celestial sphere Celestial sphere rotates once a day Sun follows path called ecliptic going around Earth once in one year ->accounts for most observations!! East West 2
3 But there was a complication. Planets were often called wandering stars because they seem to slowly move from one constellation to the next. Some stars appeared to move across the sky without staying in a constellation WANDERING STARS Planet comes from Greek word for wanderer East South West Prograde and Retrograde Motion Prograde Motion (normal) Apparent West to East motion over many nights Retrograde Motion (irregular)- Apparent East to West motion over many nights Motions occur against backdrop of stars Retrograde Motion Lecture Tutorial: Page Work with a partner or two Read directions and answer all questions carefully. Take time to understand it now! Come to a consensus answer you all agree on before moving on to the next question. If you get stuck, ask another group for help. If you get really stuck, raise your hand and I will come around. Ptolemy s Solar System Epicycle Earth in the middle, unmoving Stars fixed on the Celestial Sphere, which rotates around Earth Planets & Sun also orbit around the Earth along deferents and epicycles 3
4 Retrograde Motion: A Problem Epicycles explained why planets would sometimes move backwards More and more epicycles were needed to finetune the model Predictions were always a bit off Some versions had hundreds of epicycles! Copernican Model (published 1543) The Sun is in the middle (Heliocentric) The Earth and other planets orbit the Sun in perfect circles Retrograde motion is caused by the planets orbiting at different speeds Planets closer to the Sun orbit faster Planets farther from the Sun orbit slower Retrograde Motion in a Heliocentric Solar System Copernicus: ALMOST right! Planets orbit around the Sun: correct Planets orbit in circles: incorrect! Copernicus s predictions weren t any better than Ptolemy s! Galileo ( ) Sketches of the planets Telescopes were being made by glassworkers in the Netherlands Galileo hears about them, builds his own around 1610 Made many important observations: The Milky Way Sunspots Jupiter s four largest moons The phases of Venus 4
5 Galileo s telescope revealed that Jupiter had moons which orbited Jupiter instead of Earth. Tycho Brahe ( ) Danish nobleman with an interest in astronomy (also fake nose & pet moose) Very comprehensive, very accurate measurements of planet & star positions Moved to Prague in 1596, hired a mathematician named Kepler Developed his own geocentric Tychonic model of the universe Johannes Kepler ( ) A believer in the Copernican model Tried to explain the spacing of the planets using geometrical shapes Began working as an assistant mathematician to Tycho Tycho and Kepler Upon Tycho s death, his family sued Kepler to get back Tycho s things Kepler gave back the instruments, but not the books Tycho s observations helped Kepler deduce laws describing planetary motion Kepler s First Law Kepler s First Law Planets orbit the Sun along elliptical paths with the Sun at once focus. center A A: semimajor axis B: semiminor axis Planet B r 1 r 2 Orbit Path Sun Empty focus r 1 + r 2 = constant An ellipse is like a squashed circle Eccentricity (e) : How squashed is it? If e = 0, it s a circle (not squashed at all) If e = 1, it s a line (completely squashed) Most planets have very low e (A almost = B) 5
6 Kepler s 2nd Law A line joining the Sun and a planet sweeps out equal areas in equal amounts of time. Kepler s 3rd Law The square of the period is proportional to the cube of semi-major axis (or average distance from the Sun). t 2 A 1 t 1 A 2 t 4 If t 2 - t 1 = t 4 - t 3, then A 1 = A 2 Period: Time to orbit the Sun once Semi-major axis: Large distance from center to orbit P 2 = k x a 3 t 3 k is a constant k = 1 if P is measured in years, a in AU Astronomical Units (AU) AUs are based on the average distance between Earth & the Sun 1 AU = 1.5 x 10 8 km Easy way to compare semimajor axes of planets Earth: 1 AU Jupiter: 5 AU Saturn: 10 AU Neptune: 30 AU Example: Kepler s 3rd Law An asteroid has an average distance to the Sun of about 3 AU. What is its period in years? P 2 = a 3 (P 2 ) 1/2 = (a 3 ) 1/2 -> (x 1/2 is the same as x) P = a 3/2 P = (3 AU) 3/2 P= 5.2 years Kepler s Third Law Lecture Tutorial: Page Work with a partner or two Read directions and answer all questions carefully. Take time to understand it now! Come to a consensus answer you all agree on before moving on to the next question. If you get stuck, ask another group for help. If you get really stuck, raise your hand and I will come around. If Earth s mass were to double, how would its orbital period change? A. Its orbital period would get two times longer B. Its orbital period would get half as long C. Its orbital period would not change 6
7 Which of the following best describes what would happen if Mercury and Jupiter were to switch places in their orbits about the Sun? A. Jupiter, the larger planet, would have a shorter orbital period than before B. Mercury, the smaller planet, would have a shorter orbital period than before C. Neither of the two planets would have any change to their orbital periods 7
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