Lecture02 - Lecture#2 The Sky and Historical Astronomy...

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1 Astro 102/104 1 Lecture #2: The Sky and Historical Astronomy General Introduction to the Sky. Coordinates: Getting your bearings. Earth's spin and orbital motion. Constellations & Astrology. Classical astronomy. Modern astronomy. Astro 102/104 2 The Main Point The movements of the Sun, Moon, planets, and stars that we observe every day and night are apparent , not actual motions, because we are moving as well! Astro 102/104 3 General Introduction to the Sky Watching and knowing the sky is the key to understanding our place in the Cosmos. For most of human history, knowing the sky was critical for survival. Today, hardly anyone ever looks up... The sky moves! (or does it...) Actual vs. Apparent motion. Astro 102/104 4 Coordinates: Getting your bearings
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