1-9-2008 Lecture 3 - 2 Discovering the Universe for...

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2. Discovering the Universe for Yourself Patterns in the Sky Motions in the Sky – The Circling sky The rotation of the Earth about its axis. The Reasons for Seasons The Earth’s orbit around the Sun Precession of the Earth’s Axis The wobbling of Earth’s axis The Moon, Our Constant Companion The Moon’s orbit around the Earth The Ancient Mystery of the Planets The various planet’s orbit around the Sun 2.1 Patterns in the Sky A constellation is a region of the sky, within official borders set in 1928 by the IAU. - Often recognizable by a pattern or grouping of stars. - Some patterns, like the Winter Triangle, span several constellations. Most official constellation names come from antiquity. Some southern hemisphere constellations were named by European explorers in the 17 th th centuries. The patterns of stars have no physical significance. Stars that appear close together may lie at very different distances. Celestial sphere
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This note was uploaded on 11/28/2011 for the course ASTRO 101 taught by Professor Hartmann,bergin during the Winter '08 term at University of Michigan.

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1-9-2008 Lecture 3 - 2 Discovering the Universe for...

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