In Orthographic view the Start Clip setting has no effect. If I move the End clip it will affect both front and back clipping on the scene.
Setting the end clip to 1m (as I prefer working in metric scale) will show me a sliver of my scene that is only 1 meter deep, (determined by the clip distance). My question is this: that 1 meter distance seems quite arbitrary: 1 meter from where? X:0, Y:0 Z:0? How is the center of that visible range determined?