I mean, it doesn't take more than a model where the same area of landmass anywhere on the globe has the same chance of birhting a civilization with a need for c

I mean, it doesn't take more than a model where the same area of landmass anywhere on the globe has the same chance of birhting a civilization with a need for clocks, for the northern hemisphere to become the most likely candidate to do so simply by virtue of having much more landmass than the southern hemisphere.