Eye of the Zodiac (Dumarest Saga 13), by E.C. Tubb, paperback science fiction novel
“In the course of a continuing quest for his legendary birthplace, Earl Dumarest befriends a young man who says his home world was called Nerth.
New Earth, perhaps? Or even the original planet Dumarest seeks? He must find out.
And so Dumarest comes to Nerth – to discover that the Cyclan, his prime enemy in the cosmos, is already there . . . together with mysteries and terror that defy the imagination!”