Velocities

To get a circular orbit, the speed of the plantets differs for each radius. According to the formula: v=√^Gm/_r In this formula v is the velocity for a circular orbit, G is the gravivitional constant (6.67x10^-11 m³ kg^-1 s^-2), m the mass of the star (the masses of the planets are regard to be neglectable with respect to the mass of the star) and r the distance from the planet to the star.

Previous: Kepler. Next: Velocities 2.

See also: Orrery, The sky at night.