## Mean Earth

The size of the Mean Earth appears influentially connected to the metrological dimensions of monuments and the landforms often associated with monuments. If the earth was perfectly spherical then its degrees of latitude would all be of equal length, as if it did not spin. The degree 51-52 degrees (where Stonehenge and Avebury were located, in Southern England) has that degree length and the Mean Earth appears to have defined the notion of spiritual space for ancient human settlements by using an exact number symbolism of using lengths exactly related to the mean earth though lesser in scale.