# Latitude

The latitude is an angular value, expression of Northern positioning - Southern of a point on Ground (or another Planet), in the north or the south of the equator which is the latitude of reference.

## Definition

Theoretically, the latitude is an angular measurement, it has as a value, 0° at the equator until 90° with the Pôle S.

In Geography, there exist several definitions of latitude, owing to the fact that the Earth is not perfectly round, but are often compared with a Sphéroïde because rotating.

• the latitude Géodésique (or geographical) is the angle which the normal with the ellipsoid of reference with the equatorial plan forms. It is the latitude of the majority of the charts.
• the latitude Géocentrique is the angle which the direction forms centers of the Earth with the equatorial plan. It is especially employed in astronomy. It can deviate from the preceding one of almost 20 km.
• the latitude Astronomique is the angle which the vertical of the place with the equatorial plan forms. It is it whom one can measure directly starting from observations (astronomical navigation, Nivellement topography).

All the places of a given latitude are indicated collectively under the name of geographical Parallèle, because all these places are placed on lines parallel at the equator, forming intersection line of equatorial plane with the surface of the terrestrial sphere divided thus into two hemispheres. Contrary to the longitude whose definition requires the choice of a Méridien of reference, the latitude thus uses only natural references.

## Notation

The latitude is generally noted φ (Phi).

## Wikipedia bonds

To insert latitudes or Longitude S in an article of Wikipedia, it is recommended to use models pre-establish

## External bonds

• Theraurus Getty TGN: Free site allowing to obtain the coordinates of place name