As timekeeping advanced, accuracy greatly improved
By Richard Brill firstname.lastname@example.org
Posted on December 4, 2015 1:30 am
Updated on December 4, 2015 at 2:37 am
The earliest clocks relied on the movements of the sun and stars. A sundial consists of a stick or gnomon that casts a shadow on a flat surface with numbers to represent hours or other measures of time.