It makes sense to use Newton's law of gravitation rather than Einstein's field equations for general relativity
- why use 10 simultaneous, non-linear differential equations
, when Newton's is a good enough approximation for the job, in this case a near object like the Moon!
I can't believe the effort for that compared to the whole lack of effort on other areas?
One knew how inept this film was going to be when you saw that NASA had refused to give them permission to use its name, and they had to use 'ASA' instead!