The Research of Elliptic Motion of Bodies in Gravity Fields
It is offered the geometric model of elliptical motion of solid in the gravity field. It is introduced the new concept-motion rhomb and the algorithm of its construction which by its position, dimension of sides and diagonals completely determines the position of material point and its velocity vector, that is required at solving the main task of mechanics. It is also considered the circular motion as special case of elliptical motion and on the base of geometric argumentation the value of first orbital velocity is deduced.