is the zero (0°) longitude, from which all other
longitudes are measured. By international convention, it passes
through the original site of the Royal Observatory in Greenwich,
England; for this reason, it is sometimes called the Greenwich meridian.
the international time standard common to every place in the world.
Also known as world time.
longitude is a series of imaginary lines on the earth's surface
from the North Pole to South Pole. These lines of longitude are
used to navigate and measure distance on Earth.
Time: GMT is the former name for mean solar time
at the original site of the Royal Observatory in Greenwich, England.
Also known as universal time.