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The Celestial Sphere The Celestial Sphere A scientific model The Celestial Sphere Big Questions: Why do we use the model of the celestial sphere when studying the night sky,…

Eclipses Celestial Sphere Facts: Itâs an imaginary sphere with earth in the center. It is useful for locating constellations and stars on a star map Zenith: Zenith is the…

ASTRONOMY What you need to know to pass the test! ASTRONOMY Light year: the distance light travels in one year Light is the fastest-moving stuff in the universe. It travels…

幻灯片 1 Astrophysics --- History of Exploring the Universe 3P303 Chen Xie 3I304 Chen Li Content In astronomy, celestial sphere is an imaginary sphere of arbitrarily large…