Longitude

Longitude lines are meridians not parallels. It is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is measured by imaginary lines cycling the Earth and running through the poles and used to measure distance in degrees east or west of the Prime Meridian. The Prime Meridian passes through Greenwich, England, and is given the position of 0 degrees longitude. They run in north-south directions. They are farthest apart at the Equator and meet at the poles. They cross the Equator at right angles. They are equal in length. A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. They follow boundaries of countries because its convenient for areas in close commercial communication to keep the same time. UTC or Coordinated Universal Time is the primary time standard by which the world regulates clocks and time. Greenwich Mean Time or GMT is often used as a synonym for UTC. GMT predates UTC by nearly 300 years. Each 15-degree band of longitude is assigned to a standard time zone.