Question

Which place is used as a standard for time all over the world?

Answer 1

Hint:Standard time refers to the synchronization of clocks that takes place within one geographical region or region to a single time standard, rather than using solar time or a locally known meridian (longitude) in order to establish a local mean time standard.

Complete answer:
The Greenwich meridian acts like the basis for the world's standard time zone system. The mean solar time at Greenwich is now termed as the universal time (q.v.) Earlier it had been called the Greenwich mean time (q.v.). Greenwich meridian, imaginary line is referred while seeing the 0° longitude that passes through Greenwich followed by a borough of London, and eventually terminating at the North along with the South poles. one amongst the international conferences that was held in Washington, D.C., during the year 1884 designated “the meridian passing through the center of the transit instrument at the Observatory of Greenwich like the initial meridian for longitude.”
The observatory (renamed the Royal Greenwich Observatory) had been then transferred to Hailsham, East Sussex, at the time of the 1950s, but the real site continues like the location for 0° longitude even now. Just as the prime meridian, the north-south line at Greenwich is referred for indicating the reference for all other meridians of the longitude which are present , which are numbered east or west of it. The Greenwich meridian also acts like the basis for the world’s local time zone system. Theoretically, standard time becomes successively one hour earlier at each 15° longitude west of the Greenwich meridian and one hour later at each 15° longitude east.

Note :
Standard time is of great use, just as in large developed countries different time for various regions is followed, it'll become very hard for us to keep up jobs and services which are done at national level and keeping record would become complex , So its more convenient to follow a standard time instead of having a different time.