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| | Ancient Time Keepers |
 | | From 1500 to 1451 BC, the gnomon, which is the L-shaped indicator on a sundial, was regularly used by the Egyptians. |
 | | An early astronomer, Kiddinu, who was born in Babylon between 340 and 331 BC, devised an early version of the precession of the equinoxes which was somewhat inaccurate. |
 | | Andronikos of Kyrrhestes, from 50 to 41 BC, built in Athens the Tower of Winds, which was a water clock combined with solar clocks positioned in the eight principal directions. |
| www.umich.edu /~lowbrows/reflections/1999/lsimmons.2.html (1629 words) |
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