The Method of Coordinates
When you read in the newspapers of the launching of a new space satellite, pay attention to the statement: “The satellite was placed in an orbit close to the one that was calculated.” Consider the following problem: How can we calculate that is, study numerically the orbit of the satellite a line? For this we must be able to translate geometrical concepts into the language of numbers and in turn be able to define the position of a point in space (or in the plane, or on the surface of the earth, and so on) with the aid of numbers. The method of coordinates is the method that enables us to define the position of a point or of a body by numbers or other symbols. The numbers with which the position of the points 1p is defined are called the coordinates of the point. The geographical coordinates (with which you are familiar) define the position of a point on a surface (the surface of the earth); each point on the surface of the earth has two coordinates: latitude and longitude.
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