They are Supreme Trinity Personalities.  They are close of kin to, and are the divine equals of, the Ancients of Days, who preside over the destinies of the seven supergovernments.  There are one billion and were created by Trinity. Each of them directs one of Havona spheres.  Each embellishes his sphere according to own original plans.  Eternals of Days are not creators, but they are perfect administrators. 
Forever have Eternal of Days and Secrets of Supremacy ruled their exquisite worlds of the Paradise-Havona system, and they function without rotation or reassignment.  They appear in personality registers as the Stationary Sons of the Trinity.  Most superuniverse personnel apprenticed under the Eternals of Days on the various worlds of the perfect Havona universe.  When an Eternal of Days is absent from his sphere, his world is directed by a Trinity Teacher Son.  The Eternals of Days are visible to all will creatures dwelling in their domains.  Prior to the times of Grandfanda, high Paradise Citizens were the first executive assistants to the Eternals of Days. 
See also: UB 18:2.