Why is distributor pointing away from #1 on TDC?

I just read this on Hughes website. When you install the timing set, the dot on the cam gear points down and the dot on the crank gear points up so they are facing each other. Then you need to rotate the crank 360* so the dot on the cam is facing 12 o’clock and the dot on the crank is at 12 o’clock and that is where you install your distributor.