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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 Presentation
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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• Constellations not real• 1929 IUA – 88 official constellations• Every star belongs to a constellation
Orion Constellation
Map of Orion Constellation
The wanderers
• Sun, Moon, planets move relative to stars
• Wander in a narrow band – Zodiac
• Ecliptic
The Zodiac
The Ecliptic
The Celestial Sphere
23.5
Earth’s prograde rotation
Ursa Minor
Precession of Earth’s spin
26,000 years period
Equatorial Coordinates
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
Image Sources
Image Sources
http://fourmilab.ch/yoursky/
Image Sources