PowerPoint PresentationAstronomy deals with large numbers!Cosmic VoyageSlide 4Slide 5Slide 6Our Cosmic AddressSlide 8Slide 9Slide 10Constellations for astronomersSlide 12Slide 13Slide 14Watching the Sun move against the background stars.The Celestial SphereSlide 17Review of the terrestrial coordinatesCelestial coordinates (equatorial)Slide 20Pratice with celestial coordinatesSlide 22Slide 23Notes1QuickTime™ and a decompressorare needed to see this picture.QuickTime™ and a decompressorare needed to see this picture.2Astronomy deals with large numbers!Distance between Earth and Sun (Astronomical Unit, AU)Nearest star - Proxima Centauri - ~4.2 light years away = 271,000 AU’s = 39735067984839.36 kilometers»ROUND-OFF! KilometersDiameter of the Milky Way is ~100,000 light yearshttp://www.calculateme.com/Astronomy/LightYears/ToKilometers.htm€ =1.5 × 108kilometers€ =4 × 10139,007,199,254,740,992 or 2523Cosmic VoyageWhile you are watching The Cosmic Voyage, please write down any questions or comments on a sheet of paper, along with your name AND section, and hand it in as you leave at the end of class. We can then take care of any concerns on a personal level.Thanks!QuickTime™ and a decompressorare needed to see this picture.4567Our Cosmic AddressEarthSolar systemOrion armMilky WayLocal Group of GalaxiesLocal Supercluster of GalaxiesUniverse8….where astronomy begins.9Every star that you see in the sky is part of our galaxy, the Milky Way. Every single star.We can see 3 galaxies naked eye: Andromeda (M31), Large Magellanic Cloud (south of equator) and Small Magellanic Cloud (south of equator).10 Contrast the old definition of constellation with the astronomers’ definition of constellationState why we see different constellations during different times of the year. Summarize what is meant by the “Celestial Sphere” and why the concept is useful. Relate the celestial coordinate system to the latitude and longitude system on Earth, stating similarities and differences.11QuickTime™ and a decompressorare needed to see this picture.A specific, delineated region of the sky, stars and objects placed within official borders set in 1928.Contrast the old definition of constellation with the astronomers’ definition of constellationConstellations for astronomers12We see different constellations throughout the year.We can see Pegasus now, but not Orion. In January, we’ll be able to see Orion, but not Scorpio.Why? What is happening? What is involved? State why we see different constellations during different times of the year.13Motions in the SkyThe Reason for Seasonal Constellations State why we see different constellations during different times of the year.14 State why we see different constellations during different times of the year.15Watching the Sun move against the background stars.16The Celestial SphereSummarize what is meant by the “Celestial Sphere” and why the concept is useful.17 Summarize what is meant by the “Celestial Sphere” and why the concept is useful.18Latitude Longitude Relate the celestial coordinate system to the latitude and longitude system on Earth, stating similarities and differences.Review of the terrestrial coordinates19a projection of the Earth’s coordinate system onto the sky, with differences:Sky Latitude Declination ()Sky Longitude Right Ascension ()measured in angle (degrees, arcmin, arcsec)measured in time (hours, min, sec) Relate the celestial coordinate system to the latitude and longitude system on Earth, stating similarities and differences.Celestial coordinates (equatorial)20 Relate the celestial coordinate system to the latitude and longitude system on Earth, stating similarities and differences.21Pratice with celestial coordinatesABC22 Contrast the old definition of constellation with the astronomers’ definition of constellation23You purchase a registered star for $100 (hey, it comes with a certificate!). The coordinates are: RA: 00hr 10min 05sec and Dec: +29o 55’
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