     Its principal function is to calculate, in binary stars, the relative position of one of the stars regarding the other one, for one or more dates, and shows a graph with the location of those stars; also it let draw the apparent relative orbits. As complement, it offers an idea of the physical characteristics of each star, it offers a small but complete double stars' course with animated graphics, it gives a table with astronomical constant, starting from 5 measurements it calculates the form and orientation of the orbit in the space, it 
corrects the timed time of a measurement get by the method of Danjon, it calculate elemental Statistics of an Observation with the "Chronometric Micrometer", and list select binary systems of the firmament.
