How do you calculate longitude on a map?

Answer 1

Latitude and longitude go together to make the address of a point on the Earth's

surface. You can't calculate them, any more than you can calculate the address of

a house on the map. If there are some lines on the map that show the locations

of a few latitudes and longitudes, then maybe you can estimate the coordinates

of a point on the map by referring to the lines.

Answer 2

This system of using longitude and latitude to find exact locations on the earth is called the geographic coordinate system.

Latitude is the angle from a point on the Earth's surface and the equatorial plane measured from the center of the sphere. Lines joining points of the same latitude are called parallels, which trace concentric circles on the surface of the Earth, parallel to the equator. The north pole is 90° N; the south pole is 90° S. The 0° parallel of latitude is designated the equator. The equator is the fundamental plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres.

Longitude is the angle east or west of a reference meridian between the two geographical poles to another meridian that passes through an arbitrary point. All meridians are halves of great circles and are not parallel. They converge at the north and south poles.

By combining these two angles, the horizontal position of any location on Earth can be specified.

Answer 3

The equator is 0 degrees latitude, but any longitude from 0 to 180, either east or west, is possible.

To find the longitude of the place on the equator, measure the angle along the

equator, between the place, and the point where the Prime Meridian crosses the

equator.

Answer 4

Longitude is the angular distance measured east (0° to 180°) or west (0° to -180°) from the prime meridian (running through Greenwich, England). Longitudinal lines on Earth run north and south. They account for the full 360° of the circumference of a sphere. They are shaped like squashed half-circles.

See related links for various ways to determine longitude.

Answer 5

Longitude is the angular distance measured east (0