I am in no way smart enough to really understand mechanics, but I do understand that Newtonian mechanics predicted the existence and position of Neptune based on irregularities in other planetary orbits, so I find it hard to believe theres any novelty in accounting for interplanetary pull.
Two google searches...
The guys PhD is in the philosophy of science (which means he should know better).
His earlier publications include works on creationism, not very well received - even in bizarro-world - since the forgot to reduce the earths age to 6.000 years.
Looks like agenda-driven pseudo-science. (Re:Climate change).
I need a good book!
Gustav