April 7, 2017
I think that this system is only one out of many such systems and a literature search would be most interesting.”
We have just realized that Ron and Siemens Stain look at orbital dynamics as if they were dealing with an orrery or with the diagrams in a book for laymen. The latter always make it look as if the planets are orbiting a Sun rigidly fixed in space, or the Moon is orbiting an Earth fixed in space. Such situations would contradict Newton’s third law. In fact, the Moon and Earth are both rotating about a point some distance below the Earth’s surface. Who knows what common point a black hole and a quasar might be orbiting. How do Ron and SS hope to get valid numerical results if they do not take account of this?