Standard time Zone of India and Greenwich Time Zone

by Chandra Sekhar Sharma


Posted on 2/11/2020 2:52:15 PM



Solar time is a calculation of the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).Earth spins on an imaginary pole called its axis. Every 24 hours, the Earth makes a complete rotation — or one full turn — on its axis , called as day.India Standard Time (IST) is 5:30 hours ahead of Coordinated Universal Time (UTC). This time zone is in use during standard time in Asia.

                                           Standard Time of the world is reckoned form Greenwich, recognized as prime Meridian of Longitude. The world is divided inn to 24 standard zones ,each of 15 D of arc or 1 hour in time part. The zone to the east Greenwich are numbered form 1 to 12 with ‘minus’ sign including that the number or hours is to be  subtracted to obtain Greenwich Time. Similarly the zone west of  Greenwich are prefixed ‘plus’ indicating that the number of hours are to be added to get Greenwich Time. However the Standard Time maintained by many countries does not coincide with this Time Zone The Central Meridian of India is situated at 82 d 30 m East longitude and 23 d 11 m North latitude (Latitude of Ujjain ) . The Indian Standard Time is related to the local mean time of   82 d 30 m East. Meridian  5h 30 m ahead of Greenwich. So  the time Zone is 5h30m in India.
Daily light saving time is achieved by advancing the clock by one hour. Adjusting click time for the use of added day light on summer evening is adopted by many countries of the world .

GMT + 1 Hour                    Paris, France

GMT + 2 Hours                  Athens, Greece

GMT + 3 Hours                  Moscow, Russia

GMT + 4 Hours                  Kabul, Afghanistan

GMT + 5 Hours                  New Delhi, India

GMT + 6 Hours                  Dhanka, Bangladesh

GMT + 7 Hours                  Bangkok, Thailand

GMT + 8 Hours                  Beijing, China

GMT + 9 Hours                  Tokyo, Japan

GMT + 10 Hours                Sydney, Australia

GMT + 11 Hours                Honiara, Solomon Islands

GMT + 12 Hours                Wellington, New Zealand

GMT - 1 Hour                     Azores

GMT - 2 Hours                   Godthab, Greenland

GMT - 3 Hours                   Buenos Aires, Argentina

GMT - 4 Hours                   Halifax, Nova Scotia

GMT - 5 Hours                   New York, NY United States

GMT - 6 Hours                   Dallas, TX United States

GMT - 7 Hours                   Denver, CO United States

GMT - 8 Hours                   Los Angeles, CA United States

GMT - 9 Hours                   Juneau, AK United States

GMT - 10 Hours                 Honolulu, HI United States

GMT - 11 Hours                 Nome, AK United States

GMT - 12 Hours                 Suva, Fiji

GMT (Universal Time)    Greenwich, England