aftwo - Chapter Two Chapter Questions for the Day Questions...

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Unformatted text preview: Chapter Two Chapter Questions for the Day Questions What is a Constellation? What is Archeoastronomy? What are the motions of the sky? What is a Constellation? What Constellations are apparent star patterns in the Constellations sky. sky. Constellation patterns were based in mythology, Constellation so each culture had their own set of constellations. constellations. Constellation patterns are consistent set (88 in Constellation all) throughout the world. all) Constellations are different from star clusters Constellations which are gravitationally bound set of stars. which Constellation Simulator Constellation http://www.astro.wisc.edu/~dolan/constellations/java/Orion.html Constellation Mythology Constellation http://www.comfychair.org/~cmbell/myth/myth.html What is Archeoastronomy? What Archeoastronomy Archeoastronomy is the science of relating astronomical processes in the sky with objects located in archeological sites. objects Objects on the site need to line up with Objects astronomical events (equinoxes, solstices, eclipses, rising, and setting). eclipses, These archeological sites were usually These used by astrologers, priests, tribal leaders. Stonehenge Stonehenge http://www.amherst.edu/~ermace/sth/photos.html Stonehenge – Before and After Stonehenge Phase I 2950-2900 BCE Phase III 2550-1600 BCE http://witcombe.sbc.edu/earthmysteries/EMStonehenge.html What are the Motions of the Sky? What Motions of Stars Motion of the Sun Motions of the Moon Motions of the Planets Angular Distances Angular Degrees, Minutes, Seconds 1° = 60’ 1’ = 60” Hours, Minutes, Seconds 1 hour = 60 min = 15° 1 min = 60 sec Your hand equals 10 degrees in the sky. Angular Motion Angular The moon takes 27 days to go around in The its orbit. What is its relative motion to the stars in days? In hours? stars v=d/t v=360°/27 days v=13.33 °/days °/days v=13.33 °/days (1 day/ 24 hr) v=13.33 v=0.56 °/hour Motions of Stars Motions Diurnal Annual Due to the Earth orbiting the Sun. Procession Due to the rotation of the Earth. Due to the wobble of the Earth on its axis. Due All motions are represented in the SC001 chart. Diurnal Motion http://www.mhhe.com/physsci/astronomy/arny/instructor/ch01imagebank.html Annual Motion Annual Motion of the Sun Motion The Sun travels along the ecliptic. Due to the tilt of the Earth (23.5) The Sun rises and sets at different positions The each day. each The The Sun’s annual motion is slightly faster than the rest of the stars. than The Sun moves 2 hours in Right The Ascension each month, which is called Sidereal Time Sidereal Motion of the Moon Motion The The Moon has its own path around the sky due to a tilt of its revolutionary axis. due The Moon has phases due to amount of The sun light reflecting off the moon. sun The Moon’s synodic period (phase time) is The longer (29.5 days) than its sidereal period (time of orbit, 27 days) (time Eclipses occur when a line of nodes occur. Phases of the Moon Phases http://www.astro.wisc.edu/~dolan/java/MoonPhase.html Line of Nodes Line http://www.ccs.neu.edu/home/sblanco/astro/moon.html Motions of the Planets. Motions The planets travel around the ecliptic. The The planets seem to go backwards in comparison the stars in some parts of their orbit because the Earth passes the planet in its orbit. This is known as retrograde motion. The planet’s name means “wanderer” in The both Greek. both Planet’s Path Planet’s Retrograde Motion Retrograde Homework 2 Homework Look up on the web (at google.com or ask.com) Look to find information on an Archeoastronomy ( but not Stonehenge) site. Then write a paragraph summary about this site, please cite the website address. address. The Earth takes 365.25 days to go around the Sun. What is its relative speed to the stars in days? In hours? (Hint: Use the example in this PowerPoint.) Page 34, CQ 4,10 ...
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This note was uploaded on 12/04/2011 for the course AST 1004 taught by Professor Howard during the Fall '09 term at Broward College.

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