Anyway, MarkCC does a little more to impress me by deconstructing one of the YEC claims: That the Earth is at the center of the universe, and relativity has Earth in some time dilation where it's only been 6,000 years here, but the rest of the universe has experienced billions of years. Of course, they ignore little things like local radioactive decay rates, the results of billions of years of starlight compacted into a few millennia, everything out there blueshifting into gamma radiation, etcetera, etcetera, etcetera.
An example of Mark's takedown:
First: you can compute a pretty good approximation of instantaneous gravitational forces between bodies by treating them as point-masses at their center of gravity. But they are not point masses. And if you do anything but an instantaneous calculation, treating them as point masses will give you the wrong result. They've made a fundamental math mistake here: a simplifying assumption can only be applied in the specific type of calculation for which it was designed, in the specific situation where it was derived. They're applying it in a very different situation - they are not doing an instantaneous calculation of gravitational forces.I may not be a physics professor, but I do know that point masses may be handy for hankerchief calculations. I would think that these sorts of people would have more at their disposal, though.