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How did the inca make such precise calculations in astronomy, architectal engineering and mathmatics?

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They recorded numbers using the knots on a string called a quipu.
User Dux
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The Inca were able to make very precise calculations in astronomy, engineering and mathematics due to their use of quipu. A quipu is a recoding device made out of strings and used by a number of cultures in the Andean area. It consists of a number of strings that are tied into knots in a particular symbolic pattern. Quipu were also used to collect data, maintain records, collect census records and other types of organizational tasks.

User Katja
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