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1-1 Astronomy is both an ancient cultural practice and a cutting-edge science
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1-2 The stars are grouped by constellations
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1-3 All of the observed celestial motions can be described if our planet earth spins once each day while it orbits around our sun each year
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1-4 The Sun appears to change position over the day and throughout the year, and these changes result in Earthâs seasons
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1-5 The Moon appears to change its position in the sky hourly and its phase throughout each month
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1-6 Eclipses occur only during rarely observed events when our sun, moon, and earth are perfectly aligned
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