-
How Early Egyptians told time by shadow. They used an Obelisk, a vertical structure with four sides, by placing in the shade it cast a shadow which showed the time.
-
The people of Bablonia started using a sundial, a flat surface with a 12 hour clock face.
-
The term o'clock started being used, meaning "of the clock"
-
Mechanical clocks were introduces and knowing accurate time became possible and expected
-
As more people wrote the time the devised A.M meaning ante meridiem for day and P.M post meridiem for night. Latin meaning before noon and afternoon.
-
Many countries had started telling time using the 24 hour clock. The 24 hour clock originated with the Babylonians.