The time zone system , determined by the meridians . The GMT ( Greenwich Meridian Time , “Greenwich Mean Time”) format is currently used to express the time in any region of the world, adding or subtracting hours depending on the meridians with which each country is governed. For example, the Argentine time zone is GMT-3, while the Pakistani is GMT + 5. The application effect of this system translates into: The parallels are measured from the equator, considering the angle they form with respect to the Earth’s axis of rotation : 15 °, 30 °, 45 °, 60 ° and 75 °, both in the Northern Hemisphere (30 ° N, for example ), as South (30 ° S).The meridians are measured at the rate of one degree (1 °) for each one, starting from the so-called 0 ° Meridian or Greenwich Meridian , which is the one that passes through that exact London location, where the Royal Greenwich Observatory was once. From there the meridians can be considered East or West, depending on which direction they are in relation to this axis, and the globe is divided into 360 segments or “segments”.
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