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An observatory for careful watching
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Ages 7–9Ulugh Beg was a ruler, astronomer, and mathematician in the fifteenth century.
He built an observatory at Samarkand for observations of the Sun, Moon, and planets.
Its instruments included a large masonry arc used for astronomical measurements.
The book describes Ulugh Beg’s careful calculation of the length of the stellar year.
PAUSE & WONDER
Why might repeated measurements be better than a single guess?
PAUSE & WONDER