This is done by projecting each solid onto a concentric sphere.

The crowd formed a percolating mass of loose concentric spheres.

Eventually, perfectly concentric spheres were abandoned as it wasn't possible to develop a sufficiently accurate model under that ideal.

For certain index profiles, the lens will form perfect geometrical images of two given concentric spheres onto each other.

It would now be easy to go on and work out the field between two concentric spheres.

They passed through the gates into the second of the concentric spheres and drove for about ten minutes.

The left half is dominated by concentric spheres.

Eudoxus rose to the challenge by assigning to each planet a set of concentric spheres.

The 92 vertices lie on the surfaces of three concentric spheres.

Early models of the cosmos were based on concentric spheres (they still are in most minds).