Summer Solstice Winter Solstice Autumn Equinox Spring Equinox Seasons are dependent upon: 1.The Earths axis tilt 2.Where the Earth is on its solar revolution Summer Solstice HSW: VIDEO LINK (The Earths Seasons) 17. Equinox: when the sun is directly above the equator Solstice: when the sun is farthest N & S of the Equator 16. Why are there seasons on Earth? Seamon VIDEO: S 15.
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660-661 VIDEO 2: planetary rotation & revolution 14. ILLUSTRATION: Show how inertia & gravity create orbits. (f=ma) Newtons 3rd law of Motion: for every action, there is an equal and opposite reaction NEWTON LINK: explore the 3 laws. The greater the mass of the object, the more force is needed to move it. SIR ISAAC NEWTON: (1643-1727) Mathematician & astronomer NEWTON LINKBIOGRAPHY Newtons 1st law of Motion: objects remain still or in motion until another force is applied to it (law of inertia) Newtons 2nd law of Motion: acceleration happens when a force is acted on an object. JOHANNES KEPLER: (1600) Mathematician & astronomer Keplers laws of motion: objects travel in an ellipse around another object objects move faster when closest to the sun and slower when farthest from the sun the more distant from the sun an object is, the longer it takes to orbit the sun acts/scientists/johanneskepler.html VIDEO: Planetary orbits are Eliptical 12.
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REVOLUTION The earth travels one revolution around the sun in 365 Earth days. ROTATION The earth makes one rotation on its axis every 24 hours. LATITUDE: Measured N & S of the Equator LONGITUDE: Measured E & W of the Prime Meridian BACK A X I S and-2012-proof-earth-is-not-experiencing-a-pole-shift/ 9.
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MOTION VOCABULARY: Axis: The tilt on which the earth spins (rotates) Latitude: lines running on a map or globe Longitude: lines running on a map or globe Rotation: spinning around from one point & back around Orbit: the path one body follows around another body Revolution: the movement of a body in orbit from one point back to that point one complete trip ADVANCE 8. GALILEO GALILEI (1564-1642) Used the invention of the telescope & mathematics to look at the universe Observed The Milky Way, the moon, Jupiters moons & more sh/nael/18century/topic_3/illustrations/i mtelescope.htm PBS: Telescopes NOVA: VIDEO Galileo- Sun-centered universe (5 min) 6. PTOLEMY Worked with sundials & trigonometry astronomer who accepted the common idea that the planets & Sun traveled around the Earth! (geocentric view) WRONG!!! COPERNICUS (1473-1543) Proposed that the Earth & other planets revolved around the sun (heliocentric view) People did NOT like this idea! RIGHT IDEA!!! s/poszukiwania_en.html er.D.Golden-1/coverpage.html 5. NOTE OUTLINE: 1.Historical Astronomers 2.Motion 3.Cycles: Seasons Moon phases tides 3.