# Geographic coordinates

Geographic coordinates are a system of imaginary lines drawn over the globe or a map.

It is through the intersection of a meridian with a parallel that we can locate each point on the earth's surface.

Its coordinates are the latitude and the longitude and the principle used is graduation (degrees, minutes and seconds).

Parallels and meridians are indicated by degrees of circumferences. One degree (1 °) is one of 360 equal parts in which the circumference can be divided. A degree, in turn, is divided into 60 minutes (60 ') and each minute can be divided into 60 seconds (60 "). Thus, a degree is equal to 59 minutes and 60 seconds.

The parallels they are lines parallel to the Equator, and the imaginary line of Ecuador itself is a parallel. 0º corresponds to the equator, 90º to the north pole and -90º to the south pole.

The meridians they are lines perpendicular to Ecuador that run from the North Pole to the South Pole and intersect with the parallels. All meridians are the same size and the starting point for numbering is the meridian that passes through the Greenwich Observatory in England. Therefore, the Greenwich meridian is the main meridian (0 °). To the east of Greenwich, the meridians are measured by increasing values ​​up to 180 ° and to the west their measurements are decreasing to the limit of -180 °.

From the meridians and parallels, geographic coordinates are established which are measured in degrees, and from geographic coordinates it is possible to locate any point on the earth's surface.