Instantly Find The Center Of Any Object
This is a great tip for quickly finding the exact center of any object on its own layer. You start by pressing Command-T (PC: Control-T) to bring up the Free Transform bounding box. The bounding box has a handle in the center of both sides and center handles at both the top and bottom. Now all you have to do is make Photoshop’s rulers visible (Command-R [PC: Control-R]), and then drag out a horizontal and a vertical ruler guide to these handles to mark the center. Better still, if you have the Snap command active in the View menu, the guides will snap to the center of your object as you drag.