Definition of orb:
(n) :
a spherical body; a globe; especially, one of the celestial spheres; a sun, planet, or star; one of the azure transparent spheres conceived by the ancients to be inclosed one within another, and to carry the heavenly bodies in their revolutions
"in the small orb of one particular tear. --Shak."
(v) :
to form into an orb or circle. --Milton. Lowell; to encircle; to surround; to inclose