Question

give geographical reasons the local time at Greenwich is considered to be the International standard time

Answer 1

Setting a Standard for World Time Zones UK Time is GMT during winter - between October and MarchGreenwich Mean Time or GMT is the clock time at the Royal Observatory in Greenwich, London. It is the same all year round and is not affected by Summer Time or Daylight Saving Time.

When the sun is at its highest point exactly above the Prime Meridian, it is 1200 noon at Greenwich.

View current Sun position and Midnight/Midday on Earth.

GMT is still widely used as the standard time against which all the other time zones in the world are referenced.

Answer 2

Latitudes and Longitudes which are also known as the Geographical coordinates, play an important role in fixing local time and navigation. With the geographic coordinates, one can perfectly pinpoint a location in any part of the world using a reference location.

Usually, Greenwich prime Meridian is used as a reference location to locate any geographical coordinates across the world and calculate time of any country. Greenwich, perfectly divided the earth into equal parts and became the point of reference to calculate time and location.  

There are four standards that are used to represent the geographical coordinates. They are

Simple Decimal Standard

Decimal Degrees

Degrees and decimal Minutes

Degrees, Minutes and Seconds.

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