Patterns in the Sky
Patterns in the Sky ASTR 2010
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This 2 page Class Notes was uploaded by mkeller on Thursday September 17, 2015. The Class Notes belongs to ASTR 2010 at Bowling Green State University taught by Glenn Tiede in Fall 2015. Since its upload, it has received 66 views. For similar materials see Modern Astronomy in Art at Bowling Green State University.
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Date Created: 09/17/15
Astronomy Week One Patterns in the sky The sky tonight We are surrounded by astronomy Macroscopic scale of the universe 0 Object Distance from Earth 0 Moon 1 second in light years 0 Sun 8 minutes in light years Pluto 5 hours in light years 0 Nearest Star 4 years in light years 0 Center of Milyway 25000 years in light years Light in a year travels at 6 trillion miles Andromeda Galaxy is the next closet galaxy and is close to the same size as Milky Way Local group group of galaxies near us takes 250000 year to reach its like a big city with little towns around it Local supercluster has many other clusters of galaxies 200000000 years to cross its like a state and its cities Farthest galaxy is 12 billion years away How old Earth 46 billion years old Sun 46 billion years old Milky way 12 billion years old Universe 137 billion years old Sun s Motion Astronomy Week One North Polaris star that is on the tip of little dipper Polaris stands still Celestial equator divides the sky in half of north and south Orion winter star constilation in BG Scorpio summer star constilation in BG Ecliptic the invisible line that the sun follows in the course of a year path in the star field it moves west to east Sun Motion causes and visible effects 1 sun rises and sets each day moving west 0 because earth spins on its axis 0 We see day and night 2 Sun moves eastward through the star field along the ecliptic 0 because earth revolves around sun 0 we see different constellations in different months 0 A given star consellation rises 4 minutes earlier each day 0 Two kinds of days solar and side real What is a day Side real day time for star field to spin once for earth to rotate once 23hr 56 mins Solar day time from noon to noon 24hrs longer than sidereal day because the sun moves east along ecliptic because earth moves in orbit 3 Sun shifts North and South annually 0 North of celestial equator in June half of year 0 South of celestial equator in December half of year 0 Because earths equator is tilted to orbit by 235 degrees 0 Suns daily path crosses differently as months go by What makes a season NOT distance of sun Orbit around sun is almost a circle Jan 3rd we are closet to sun Jul 4th we are farthest from sun
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