The Nile, Divided in its Seven Streams

In ancient times, the Nile had seven branches to the sea: the Pelusiac, Tanitic, Mendesian, Phatnitic, Sebennytic, Bolbitine, and Canopic. In myth, the Nile is the Milky Way and the sea is the material world. The seven streams by which the influences of the spiritual world empty into ours are, of course, the seven planets. Perhaps this is where the notion that every guardian angel's influence resonates most greatly with some one or the other of the planets comes from.