Time Standards By Ashish singh Nov,08,2021 The Royal Greenwich Observatory in London is the site of the Prime Meridian used in Greenwich Mean Time, the earliest internationally accepted time standardSince its establishment in  the General Conference on Weights and Measures in 1967, the globally accepted standard of time measurement is the SI System (see the section on Units of Measurement), which uses the second as the base unit of time. Timekeeping is so important in the modern world, bot...

Periodization By Ashish Singh Nov,08,2021 Periodization is the division of time into convenient periods or blocksWhen dealing with time scales longer than those usually measured by calendars and clocks, the longer-term past can be divided up into convenient periods or blocks of time in a process known as periodization. Although records exist for most of human history, for longer time scales we must rely on geological and paleontological dating techniques. To some extent, the start and end o...

Clocks By Ashish singh Nov,08,2021 Clocks of one sort or another have been around for thousands of yearsA clock is any free-standing device or instrument for measuring or displaying the current time. The English word “clock” comes from the Celtic words clocca and clogan, both meaning “bell”. A chronometer is an exceptionally precise mechanical timepiece, designed to be accurate in all conditions of temperature, pressure, etc, especially one used at sea. Watches are sometimes distinguishe...