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Name ______________________________________ Date ___________ Period ____ Earth Motions and the Heavens Guiding Questions What are the basic Earth motions? What are the apparent celestial motions associated with Earth’s rotation? What are Star Trails? What is the apparent hourly rate of motion of the stars? How do star trails change with direction? How is Polaris different from other stars? What is special about Circumpolar Stars? Why does Orion look different in the Southern Hemisphere? What is the affect of latitude on star trails? What is the affect of Earth’s Revolution on the sky? How far do stars shift every night due to Earth’s rotation? How does Earth’s revolution affect the times of star rising and setting? What is the ecliptic? What is the affect of Earth’s revolution on constellations blocked by the sun? What is the Zodiac? What is the 13th sign of the Zodiac? How does Precession affect the night sky? What is the precession of the equinoxes? Bedell Astronomy Elective 2012-2013 Sky Watching What are the basic Earth motions? Questions Key Words What are the basic Earth Motions? Notes Rotation Revolution Precession http://www.astro.virginia.edu/class/oconnell/astr1230/im/precess-NS.gif Summary Bedell Astronomy Elective Sky Watching Page 2 What are the apparent celestial motions associated with Earth’s rotation? Questions Key Words What are Star Notes Trails? What is the apparent hourly rate of motion of the stars? How do star trails change with direction? Summary Bedell Astronomy Elective Sky Watching Page 3 What are the apparent celestial motions associated with Earth’s rotation? Questions Key Words How is Polaris Notes different from other stars? What is special about Circumpolar Stars? Why does Orion look different in the Southern Hemisphere? What is the affect of latitude on star trails? Summary Bedell Astronomy Elective Sky Watching Page 4 What is the affect of Earth’s Revolution on the night sky? Questions Key Words Notes How far do stars shift from night to night? \http://www.astro.virginia.edu/class/oconnell/astr1230/solsys.html How does Earth’s revolution affect the times of star rising and setting? Summary Bedell Astronomy Elective Sky Watching Page 5 What is the Ecliptic? Questions Key Words Notes What is the ecliptic? What can we see along the ecliptic? How is the ecliptic related to the seasons? Summary Bedell Astronomy Elective Sky Watching Page 6 What is the affect of Earth’s Revolution on the constellations blocked by the Sun? Questions Key Words Notes http://www.astro.virginia.edu/class/oconnell/astr1230/solsys.html What is the Zodiac? What is the 13th sign of the Zodiac? Summary Bedell Astronomy Elective Sky Watching Page 7 How does Earth’s precession affect the night sky? Questions Key Words What is precession? Notes Summary Bedell Astronomy Elective Sky Watching Page 8 What is the ‘Precession of the Equinoxes”? Questions Key Words What is the ‘Precession of the Equinoxes”? Notes “Age” Tropic of Cancer Tropic of Capricorn Summary Bedell Astronomy Elective Sky Watching Page 9 Questions Key Words Notes The constellation in which we see the vernal equinox determines the “age” in which we live. Use your planisphere to determine the “age”. _____________________ Precession causes the equinox constellation to shift west. Early in the 21st Century the equinox will move west and begin the age of _______________________. What constellation is the sun in on June 21? ___________________ Where is the sun at zenith? ____________________________ What constellation is the sun in on Dec. 21?_________________________ Where is the sun at zenith? ___________________________ When these places were named, the sun was in Cancer and Capricorn, respectively. Precession takes approximately 26,000 years (25, 780 years) Summary Bedell Astronomy Elective Sky Watching Page 10