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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