Inspired by this question/answer.
Given that the novel by Macey was written four years prior to the first broadcast of Hitchhiker's Guide to the Galaxy and subsequent novelization, is there any evidence to suggest that Douglas Adams was aware of/referencing the Macey book, Stationary Orbit?
Pre-emptively acknowledging that this is possibly a duplicate of this question (though, that is a list and this is looking for a specific answer regarding the two works).