[Someone]

You would need different math for star forts such as Palmanova (https://en.m.wikipedia.org/wiki/Palmanova), or for 17th century Amsterdam, with its radial grid (https://www.google.com/maps/d/viewer?mid=1_XUR_LAcsSSE9Lmx2S...)

Such a circular grid has the advantage that it is easy to find its center.