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The sun was the first timekeeper, and many people still use it today to help spot direction or approximate time. This ancient sundial casts its shadow on the castle walls of St. Michael's Mount in Cornwall, England.

Simple theodolite, Italian, 1676 / Collection: SCM - Surveying / Object Name: simple theodolite; magnetic compass / Maker: Macarius, Johannes Place

The famous astronomical clock created in 1472. It includes a calendar which will have to be reset for the first time in 2017. Inside St. Mary's Church. Rostock, Germany. Photo by Alan Osborn.

File:City of London, St. Dunstan-in-the-West clock.The clock, dating from 1671. - - 865114.jpg