lecture08 - Astronomy Picture of the Day Globular cluster...

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Unformatted text preview: Astronomy Picture of the Day Globular cluster NGC 6934 observed by Hubble Announcements • Quiz on friday in discussion section. Please bring: • A scantron form F-288-PAR-L • A pencil • Calculators are not allowed. • 10 questions, 25 minutes (2nd half of discussion section) • You must take the quiz in the section that you’re registered for! No substitutions. The Night Sky The Night Sky You are here The Celestial Sphere ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ • The horizon is the line marking the boundary between earth and sky • The zenith is the point that is directly overhead (straight up) from the observer The Celestial Sphere zenith horizon ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ ˒ • The North Celestial Pole : the point directly overhead from the earth’s north pole • The Celestial Equator : the circle separating the northern and southern hemispheres on the celestial sphere North celestial pole South celestial pole earth’s north pole earth’s south pole celestial equator Motion of the stars • The earth’s rotation is eastward • If we look at the path of stars directly above us, they appear to be moving westward across the sky Motion of the stars The view from the north pole The view from the north pole ˒ N S NCP horizon ˒ ˒ celestial equator • For an observer at the north pole, stars never rise or set: they just move in circles centered on the zenith • From the earth’s north pole, you can see the entire northern celestial hemisphere, but you can’t see any of the southern celestial hemisphere The view from the north pole ˒ N S NCP horizon ˒ ˒ celestial equator The view from the north pole • Looking up at the sky from the earth’s north pole, stars will appear to move in circles around the north celestial pole ˒ ˒ ˒ NCP The north star • The bright star close to the north celestial pole is Polaris, the “north star” Polaris The view from the equator The view from the equator ˒ N S NCP horizon ˒ ˒ SCP c e l e s t i a l e q u a t o r • For an observer at the earth’s equator, the north and south celestial poles are on the horizon • All stars in the sky rise in the east, stay above the horizon for 12 hours, and then set in the west The view from the equator ˒ N S NCP horizon ˒ ˒ SCP c e l e s t i a l e q u a t o r The view from the equator The view from intermediate latitudes • Irvine is at latitude 33° 40 ′ north of the equator • The celestial equator cuts diagonally across the sky The view from Irvine ˒ N S N C P horizon ˒ S C P c e l e s t i a l e q u a t o r ˒ ˒ •...
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lecture08 - Astronomy Picture of the Day Globular cluster...

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