NS206_Ch1 - NS 206 Inside the Milky Way Chapter 1 The...

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NS 206 Inside the Milky Way Chapter 1 The Foundations of Astronomy
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What do we see?
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Constellation Orion
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Orion in 3D
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Constellations Near Orion
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The Celestial Sphere
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We now know how these pictures are made:
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11 hour Star Trails http://apod.nasa.gov
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The Celestial Coordinates Declination: degrees, north (0 b +90) or south (0 b -90) of the celestial equator ight Ascension: Right Ascension: measured in hours, minutes and seconds (0 b 24h), eastward from the position of the Sun at the vernal equinox
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Earth in Motion-I • Motion around the Sun + rotation around its axis • Daily cycle, noon to noon, is a solar day (24 h) A sidereal day ; with respect to the distant stars (comes from Latin word sidus means star; 23 h 56 m )
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12 constellations that Sun moves through during the year are called the zodiac ; apparent path is the ecliptic Earth in Motion-II
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The Ecliptic Autumnal equinox Vernal equinox
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The Seasons
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Motion of the Moon Moon takes about 29.5 days to go through whole cycle of phases – synodic
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NS206_Ch1 - NS 206 Inside the Milky Way Chapter 1 The...

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