• The time of a place is related to the position of the sun in the sky, which depends on the longitude of the place
  • The earth rotates from west to east and completes a full circle of 360 degrees in about 24 hours
  • This means that the earth rotates through 15 degrees of longitude in one hour and one degree of longitude in four minutes
  • The meridian that passes through Greenwich, a place near London, is taken as the Prime Meridian or 0° longitude
  • The time at the Prime Meridian is called the Greenwich Mean Time (GMT) or Universal Time (UT)
  • The places that are east of the Prime Meridian will have sunrise earlier and will be ahead of GMT
  • The places that are west of the Prime Meridian will have sunrise later and will be behind GMT
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Davneet Singh's photo - Co-founder, Teachoo

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo