Calendars were one of the earliest calculating devices developed by civilisations. Find out about the Mayan calendar in this article.
The second of three articles on the History of Trigonometry.
The first of three articles on the History of Trigonometry. This takes us from the Egyptians to early work on trigonometry in China.
Noticing the regular movement of the Sun and the stars has led to a desire to measure time. This article for teachers and learners looks at the history of man's need to measure things.