Can I re-center  circular sketch to 0,0 coordinates?

My drawing began in a ambiguos location, but I need to re-set center of drawing to 0,0 coordiante to use  a zer reference for remainder of work.

Is there  a way to begin from a 0,0 coordiante so I do not have this problem in the future?

I am absolutely a newbie. If anyone would like to make a recommendation for a training\tutorial resource (i.e., printed manual). this is also greatly appreciated.

Thanks

Gary