Chapter 1-Universe as we know it

Chapter 1-Universe as we know it - Observing the Sky The...

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Observing the Sky: The Birth of Astronomy The Sky Around Us
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The Celestial Sphere Celestial Equator North and South Celestial Poles Horizon Zenith
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Circling the north Celestial Pole
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Star Circles at Different Latitudes North and south circumpolar zones
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The Ecliptic Constellations on the Ecliptic Zodiac – the 18 degree wide belt around the ecliptic Constellation today means one of the 88 sectors into which we divide the sky
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The Celestial Tilt
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1.2.3 Measurement of the Earth by Eratosthenes The Sun is so distant that all the light rays striking the Earth approach along parallel lines. Eratosthenes noticed that on the first day of summer at Syene in Egypt, sunlight struck the bottom of a vertical well at noon. At the corresponding time and day in Alexandria he observed that the Sun
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Chapter 1-Universe as we know it - Observing the Sky The...

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