Yet slower than biological evolution is the time scale of astronomical change. The relations among the celestial bodies of the solar system were first depicted mathematically by Newton. The precision with which the field of celestial mechanics is able to describe the movements of bodies of the solar system is due to the incredibly slow time scale of astronomical, evolutionary change. Boulding's longstanding concern was that equilibrium analysis, market dynamics and growth theory as practised in conventional economics are based on the mathematics of difference and differential equations, as found in celestial mechanics.