It is said that Rene Descartes was lying, ill in bed, when he noticed an insect on the ceiling. He realised that he could identify the exact location of the insect by specifying only two numbers: the distance of the insect from a given corner of the room in two different directions.
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It is called The Origin. You can go to Wikipedia.com and get more information on The Origin.
The Cartesian coordinate system was invented in the 17th century. The idea of this system was developed in 1637.
The center of the cartesian coordinate plane is called the origin and is located at the point (0,0), where the x and y axis meet.
In 2-dimensions, the Cartesian coordinate system comprises a pair of axes meeting at right angles at a point called the origin. Conventionally the axes are identified as the x-axis (going from left to right) and the y-axis (going from the bottom to the top).Every point of the Cartesian plane is allocated an ordered pair of numbers, called coordinates. The first number (abscissa) represents the distance of the point to the right of the origin and the second (ordinate) represents the distance in the upward direction. If the point is to the left or below the origin then the corresponding coordinate is negative.
A Cartesian coordinate system, or rectangular coordinate system, is a 2-dimensional coordinate system. The X-axis and Y-axis only intersect at one special point called the origin. This point has the coordinates of (0,0).Wikipedia has particulars, and a link is provided.