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While reading a map showing time zones, a child asks ‘why are +5, -5, +3, -3 etc. marked on this map?'. Which of the following must be included by the teacher while clarifying the student’s query in her class? (A) International time zones (B) Relative position of longitude of the particular place from Greenwich (C) Relative position of latitude of the particular place from Greenwich

While reading a map showing time zones, a child asks ‘why are +5, -5, +3, -3 etc. marked on this map?'. Which of the following must be included by the teacher while clarifying the student’s query in her class? (A) International time zones (B) Relative position of longitude of the particular place from Greenwich (C) Relative position of latitude of the particular place from Greenwich Correct Answer Only (A) and (B)

Longitude is the angular distance along the equator measured in degree.

  • It is measured east or west of Greenwich (0°), from 0° to 180°.
  • All meridians of longitude converge at the poles.
  • The meridians of longitude refer to the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime (Greenwich) Meridian.
  • Lines of longitude are often referred to as meridians.

Additional Information

  • The earth rotates from west to east, those places east of Greenwich will be ahead of Greenwich time and those to the west will be behind it.
  • The earth has been divided into twenty-four time zones of one hour each. Each zone thus covers 15° of longitude.
  • India located east of Greenwich at 82°30'E is 5 hours and 30 minutes ahead of GMT.

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