Draw a circle, with its center at the cross hairs, and large enough to go around everything you want centered.
edit: Group the objects along with the large circle.
Select the grouped objects. Then shift select the circle you want to align the objects with. Then use the Align Selected Objects and the Align to selected method to center. Ungroup the objects. Delete the large circle.
If you don't group the objects, each individual object will be moved separately to be centered on the selected circle. Interesting.
Good judgement comes from experience.
Experience comes from bad judgement.