astronomy is a nocturnal activity
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Astronomy is a nocturnal activity. 1953, T. E. Houck and A. D. Code. The sky above us. Stars dominate the night sky. Relative positions of stars remains fixed The whole pattern revolves around us Constellations – patterns in star distribution Constellations vary – related to mythology - PowerPoint PPT PresentationTRANSCRIPT
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Astronomy is a nocturnal activity
1953, T. E. Houck and A. D. Code
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The sky above us
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Stars dominate the night sky
• Relative positions of stars remains fixed• The whole pattern revolves around us• Constellations – patterns in star
distribution• Constellations vary – related to mythology• Constellations not real• 1929 IUA – 88 official constellations• Every star belongs to a constellation
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Orion Constellation
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Map of Orion Constellation
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The wanderers
• Sun, Moon, planets move relative to stars
• Wander in a narrow band – Zodiac
• Ecliptic
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The Zodiac
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The Ecliptic
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The Celestial Sphere
23.5
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Earth’s prograde rotation
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Ursa Minor
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Precession of Earth’s spin
26,000 years period
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Equatorial Coordinates
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Examples
• Orion:
• Right Ascension: 5 hours
• Declination: 5 degrees
• Ursa Major = Saptarshi Mandal
• The Great Bear (Big Dipper)
• Right Ascension: 11 hours
• Declination: 50 degrees
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Image Sources
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Image Sources
http://fourmilab.ch/yoursky/
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Image Sources