A system It is a set of elements that interact and maintain interrelationships with each other. The concept of reference , for its part, is linked to an allusion or to the relationship that one thing has with a different one.
It is known as reference system to the group of conventions that an observer uses to the measurement of the physical quantities of a given system . This means that the values of these quantities are linked to the reference system in question.
Reference systems are usually coordinate sets . In this way it is possible to place different points in the physical space and place events in a chronological order.
The observer of a physical phenomenon, in short, observes an event through a certain reference system. By observing the trajectory of a body In motion, the measurement of distance and other variables will depend on their location in the reference system.
The reference system can be one-dimensional (for the observation of movements that develop in a linear manner), two-dimensional (movements that take place in a flat ) or three-dimensional (movements that take shape in space).
Take the example of the geodesy . This science dedicated to the study of the magnitude and figure of the globe adopted a reference system that sets the position of origin as the geocenter (the center of mass of the planet) and then establishes certain conventions to define the axes X (linked to the equatorial and Greenwich ), Z (it is related to the axis of terrestrial rotation) e AND (which is associated perpendicularly to the plane XZ ).