Time is one of the most precious commodities in our lives. Everybody needs to know what time it is to be where they are supposed to be. Everybody also needs to be aware of the time of year, so that they dress appropriately. And, everybody needs to keep track of time during sporting events such as football, baseball, soccer and running track events. Time has even been key dramatic elements to movies and literature such as Back to the Future, Time Traveler and The Time Machine. Time is a key part of everyone's life.

The measurement of time has been a progression throughout history. The history of timekeeping actually dates back to Ancient Egyptian era of around 3500 BC. Historians believe that the first timekeeping device was created using the sun to keep track to the changes in time. From the sundial, other time measuring devices were created including the hourglass where sand flows from one part of the glass to the other in generally a set period. Through history other devices such as water clocks, coo-coo clocks, modern movement clocks and to the present day atomic clock which is the standard by which time is measured.

Time and the accurate measurement of it is a vital part of our lives. It has also taken a very interesting path to our current time measurement devices. To learn more about sundials, hourglasses, clocks, watches, world time and the International Date Line, here are some informative resources: