Astronomy chapter 1,2
Astronomy chapter 1,2 astronomy 170
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This 3 page Class Notes was uploaded by Neil Patel on Sunday February 8, 2015. The Class Notes belongs to astronomy 170 at University of Arizona taught by Dr. Bargden in Fall. Since its upload, it has received 111 views. For similar materials see Neil Patel in Astronomy at University of Arizona.
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Date Created: 02/08/15
Textbook cosmic p Chapter 1 Light Year The Light travels at a speed of 300000 distance light travels in one year 0 trillion kilometers or 6 trillion miles Astronomical Unit Average distance between the earth and the sun Light travels at a speed of 300000 kms 1 Moon to earth 1 second 2 Sun to earth8 minutes 3 Sirius to earth 8 years 4 Andromeda galaxy to earth 25 million years Looking far away is the same thing as looking back in to time The suns diameter is 10x the size ofJupiter39s diameter Jupiter diameter is 10x bigger than earths diameter The earth39s axis is tilted by 235 degrees If the earth stood still 46 6395 of at the equator Tucson would be 40x the body weight for that second Stopping in half a second would kill you for sure The average distance between the earth is 1 AU is about 150 million Km By measuring something called quotredshiftquot and concluded that galaxies outside of our own are moving away at great speeds The more distant the galaxy the faster the velocity The closer the galaxy is to us the slower it moves The farther the galaxy is to us the faster it moves Chapter 2 The sky and the things we notice 1 East to West circles 24hrs 2 Lunar phases month 3 Seasonal changes year 4 Earth Precession 10005 of years Concepts What is a constellation What is a celestial sphere Why do we see the Millq way Why do stars rise and set Why do the patterns of stars rely on our latitude and time of year Constellations o 88 Of cial constellations Patterns have no real physical meaning simply projections on celestial sphere Today they are used as convenient land marks for observing Measuring the night sky Angles not distances are used to measure the separation and positions of objects in the sky Circle360degrees 1 degree60 minutes of arc Fist is 10 degrees The moon is 5 degrees Circumference of a circle 2 pix radius Angular size 360 degrees x physical size2pi x distance An objects angular size appears smaller if it is farther away If distance increases angular size decreases As the earth rotates from the west to the east the sky appears to rise in the east and set in the west The slq varies with latitude but not longitude The orbital path of the moon is tilted by 5 degrees relative to the earths pat around the sun o It must be a full moon lunar eclipse or new moon solar eclipse 0 The moon must be at or near the ecliptic plane Ecliptic is the apparent path of the sun over a year moving through certain constellations Planets usually move slightly eastward from night to night relative to the stars 0 However during certain periods planets move westward relative to the stars Apparent retrograde motion is straight forward for us to explain if we know that earth is not at the center Many ancient Greeks believed that the earth was at the center and the sun was orbiting the earth They also did not believe that the stars were as far away as they really are or that the earth could be moving These notions seemed contrary to their daily experiences Stellar Parallax Chapter 3
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