Astronomy is a nocturnal activity 1953, T. E. Houck and A. D. Code.

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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

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