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The Ruler tool

In Photoshop CS3, you can use the Ruler tool that will help you further with positioning objects. It calculates the distance between two points. You can access the ruler from the toolbar as shown in the image below.

To begin, select the Ruler tool then drag from the point where you want to start to the end point. For example, in the image below, I drew a line from the top left edge of the rim to the opposite edge. You can hold down the Shift key while creating the measurement line if you want the line to constrain to a horizontal, vertical, or 45º angle. If you make a mistake, you can click and drag on one of the two ends of the measurement line.

After you created a measurement line, you can see the measurement data in the option bar near the top of the Photoshop interface. Make sure that you have the Ruler tool selected or else you won't see this data there.