Evolution of Timescales from Astronomy to Physical Metrology
Seasons, the phases of the Moon and the changing aspect of the Sun in the sky have long provided us with opportune means to mark the changes in our environment. Devices of various degrees of sophistication have been developed throughout history to make the necessary observations, and along with those devices, create timescales. The evolution of devices, algorithms and the underlying philosophical concepts of time itself continues today, and is likely to continue into the future.
Presented by: Dr. Dennis McCarthy, U.S. Naval Observatory