**Coordinate** it is a concept that is used in the **geometry** and that allows naming the lines used to establish the **position** of a **point** and of the planes or **axes** linked to them.

It is known as **coordinate system** to the set of values that allow to identify unequivocally the position of a point in a Euclidean space (a type of geometric space). The simplest coordinate systems are defined on flat spaces.

The notion of **coordinates origin** it refers to the point that acts as a reference within the framework of a coordinate system This means that, at that point, the value of all the coordinates of the system has nullity (in the case of a two-dimensional system, 0,0).

Within the scope of Geometry, we cannot overlook the existence of what is known as Cartesian coordinates, which are also known by the name of rectangular coordinates. They can be defined as that reference system that is used to locate and place a specific point in a given space, taking as reference what are the X, Y and Z axes.

More specifically, those are identified because there are two axes that are perpendicular to each other and also cut into what is a point called origin. It should also be stressed that the X coordinate is called abscissa and the Y coordinate is called ordinate.

In addition to the above, it should be noted that these Cartesian coordinates are named in honor of the French mathematician René Descartes who developed his well-known analytical geometry and used what is known as the origin of coordinates as the central axis of it.

Nor can we forget the existence of the polar coordinate within that field. This is the one used to establish the position of a specific point on a plane, with the point and the pole as references.

We also find the concept of coordinate plane which is the denomination that is used to refer to each of the three planes that are cut at a given point and that are vital to be able to proceed to establish the position of other points through the coordinate lines existing.

The **Geographical coordinates** , meanwhile, constitute a subtype of the so-called spherical coordinates since they allow defining points on the **land** (a spherical surface). Although there are different kinds of coordinates, the most frequent system is the one that uses latitude and longitude (for example, 53: 24.2-120: 25.0)

Latitude (north or south) and longitude (east or west) allow us to know the lateral angles of the Earth's surface. Both angular coordinates, which are measured from the center of the planet, are part of a spherical coordinate system that is aligned with its axis of rotation.

The **celestial coordinates** , on the other hand, are the values that indicate the position of a body in the celestial sphere according to a certain reference system. According to the reference plane and its origin, different celestial coordinates appear.