21. Such frequency modulation can occur, for instance, due to a pulsar's orbital motion in a compact binary. 22. In these cases, the magnetization arises from the electrons'orbital motions , which can be understood classically as follows: 23. Their orbital motion is very, very eccentric, 24. The A component is held stationary and the relative orbital motion of the B component is shown. 25. The reverse is true at " b ", where the perturbation retards the orbital motion of Uranus. 26. The true orbit is the shape of the orbit viewed perpendicular to the plane of the orbital motion . 27. Since both effects are caused by the effect of orbital motion on alignment, they are very closely related. 28. Binary stars provide the only direct way to measure the mass of stars, from observations of their orbital motions . 29. This creates a cloudy water column which travels under tidal influence as the wave orbital motion is in equilibrium. 30. He guessed the same force was responsible for other orbital motions , and hence named it " universal gravitation ".
