While describing the location of a place we need to consider one parallel and one meridian. For describing extent of a region we need to consider two parallels and two meridians The parallel at 23 degree 30 minutes North is called Tropic of Cancer .The parallel at 23 degree 30 minutes South is called Tropic of Capricorn. The parallel at sixty six degree 30 minutes North is called Arctic circle The parallel at 66 degree 30 minutes South is called Antarctic circle .The smallest country in the world is Vatican City .The Prime Meridian is also called Greenwich Meridian, purpose of Prime Meridian to fix the Global standard time. Global standard time is also known as Greenwich Mean Time.Upto which parallel from the equator can't the sunrise be perpendicular? Tropic of Cancer and Tropic of Capricorn. The international date line is marked with reference to 180 degree meridian.

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