A Short History of the Sundials

Already thousands of years ago it was clear to human beings that the length of the shadow is varying throughout the daycourse being shortest at noon. Now it was only a short step from this insight till the measurement of time.

The principle of the sundial is well-known in China since 2679 B.C., and about 1100 B.C., they use a gnomon to define the exact day-time. About 100 B.C. Lo Hsia Hung uses an armillary sphere (ballring).

Also in India sundials are used since centuries, well-known e.g. are the stone sundials in Jaipur and Delhi, erected by the maharaja of Jaypur, Jai Singh II. in the 17th century.