Below you can see the front-view size comparison of the Nikon P7800 and Kodak Astro AZ651. The Kodak Astro AZ651 is clearly the smaller of the two cameras. Its body is 119 mm narrower, 78 mm shorter and 50 mm thinner than the Nikon P7800.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.