Portal:Time/Did you know
From Wikipedia, the free encyclopedia
...that the second was known as a "second minute", the second small division of an hour.
...that the second is defined as the duration of 9,192,631,770 oscillations between the two hyperfine levels of the ground state in the Cesium-133 atom.
...that the smallest unit of time that could ever be measured is the Planck time (~ 5.4 × 10−44 seconds).
..that despite Herodotus's claim that the sundial was invented in Babylon, the oldest known example is from Egypt?
... that merkhets were Ancient Egyptian timekeeping devices that tracked the movement of certain stars over the meridian in order to ascertain the time during the night, when sundials could not function?
