 It is important to stress that Whitehead had no intention of improving the predictive content of Einstein’s GTR, only the explanatory content. However, Whitehead’s replacement of Einstein’s explanation with an alternative explanation entailed a replacement of Einstein’s formulae with alternative formulae; and these different formulae implied different predictions. So it would be incorrect to say that Whitehead’s ATG is empirically equivalent to Einstein’s GTR. What can be claimed, however, is that for a long time Whitehead’s theory was experimentally indistinguishable from Einstein’s theory.