How to align 2 pivot points

I have a circle split into segments and a heptagon (7 sides) (see image).
I need the center of the heptagon and circle to snap to the same point.
i thought i could snap them both to a place on the grid but i cant seem to snap the centres of both objects to the same point. It's quite important because this image will be printed at 1.5m by 1.5m. So the heptagon has to align with the circle exatly as any errors will be exposed when printed at this size.
Any help would be greatly appriciated. I have only started to learn illustrator...so thanks in advance!
Tony

Tony,
I had to leave for quite a while, and then I realized the snapping option James then presented, and a way to make everything easy and possible:
With Smart Guides turned on:
1) Copy the heptagon in the same place and Object>Path>Average, this is the centre (of gravity) of the heptagon;
2) Create a no fill no stroke circle large enough to extend past all points of the heptagon;
3) Move the circle centre to snap to the centre of the heptagon, also select the heptagon and its centre, and Group;
4) Snap the group to the centre of the circle.
This will allow you to rotate the heptagon freely at any time after step 3).

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can this post help?
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Your Operating System details.
Amount of installed RAM.
Amount of free disk space.
Make/Model of Video Card.
Printer Details if you have a print problem
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