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...tudy in [[Europe]] dates to the work of [[Leonardo Fibonacci]] in the 13th century AD, which introduced [[Arab world|Arabian]] and [[India|Indian]] ideas to t ...es comes from problem 79 of the [[Rhind papyrus]], which dates to the 16th century BC. The problem concerns a certain [[geometric series]], and has similarit ...

...ropical" was lent to the period of the seasonal cycle . The early Chinese, Hindus, Greeks, and others made approximate measures of the tropical year. In the 2nd century BC [[Hipparchus]] measured the time required for the Sun to travel from an ...