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2-1 Naked-eye astronomy had an important place in civilizations of the past
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2-2 Eighty-eight constellations cover the entire sky
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2-3 The appearance of the sky changes during the course of the night and from one night to the next
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2-4 It is convenient to imagine that the stars are located on a celestial sphere
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2-5 The seasons are caused by the tilt of Earthâs axis of rotation
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2-6 The Moon helps to cause precession, a slow, conical motion of Earthâs axis of rotation
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2-7 Positional astronomy plays an important role in keeping track of time
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2-8 Astronomical observations led to the development of the modern calendar
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