Adler Planetarium, Chicago

“The stars in order twinkle in the skies,
And fall in silence, and in silence rise.”        — William Broome, 1689-1745

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American southwest used walls and windows to note the season (c.1100):

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Chinese astronomers watched the sun’s shadow move each day to measure the length of the year. (c. 1200):

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Astronomers at Machu Picchu watched the rising of sun through windows to mark holy days (c. 1500):

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These ancient methods foreshadowed the later astronomy development… Photos were taken at the Adler Planetarium, Chicago.

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