[PAR] [TLE] Bombay Time [SEP] Bombay Time was one of the two official time zones established in British India in 1884.  The time zone was established during the International Meridian Conference held at Washington, D.C in the United States in 1884.  It was then decided that India would have two time zones, with Calcutta (now Kolkata) using the 90th meridian east and Bombay (now Mumbai) the 75th meridian east.  Bombay Time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time (GMT). [PAR] [TLE] Greenwich Mean Time [SEP] Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London.  GMT was formerly used as the international civil time standard, now superseded in that function by Coordinated Universal Time (UTC).  Today GMT is considered equivalent to UTC for UK civil purposes (but this is not formalised) and for navigation is considered equivalent to UT1 (the modern form of mean solar time at 0° longitude); these two meanings can differ by up to 0.9 s. Consequently, the term GMT should not be used for precise purposes.
[PAR] [TLE] Bombay Time [ SEP ] Bombay Time was one of the two official time zones established in British India in 1884 . The time zone was established during the International Meridian Conference held at Washington , D.C in the United States in 1884 . It was then decided that India would have two time zones , with Calcutta ( now Kolkata ) using the 90th meridian east and Bombay ( now Mumbai ) the 75th meridian east . Bombay Time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time ( GMT ) . [PAR] [TLE] Greenwich Mean Time [ SEP ] Greenwich Mean Time ( GMT ) is the mean solar time at the Royal Observatory in Greenwich , London . GMT was formerly used as the international civil time standard , now superseded in that function by Coordinated Universal Time ( UTC ) . Today GMT is considered equivalent to UTC for UK civil purposes ( but this is not formalised ) and for navigation is considered equivalent to UT1 ( the modern form of mean solar time at 0 ° longitude ) ; these two meanings can differ by up to 0.9 s. Consequently , the term GMT should not be used for precise purposes .
Bombay Time is set at 4 hours and 51 minutes ahead of the mean solar time at what observatory?
Bombay Time is set at 4 hours and 51 minutes ahead of the mean solar time at what observatory ?
Royal Observatory
Royal Observatory