War-Lords of the Moon - Linton Davies

Bruce Ross, on the Earth-Moon run, asked a simple question, "How are the stars behaving, Harry?" But Harrell Moore could only stare at him in horror. For the stars had run amok—cosmic engines of destruction in the hands of the twisted genius of the Moon! A rip-snortin space shoot-em-up from 1939 with space ships, an evil genius who follows his horoscope and plans to rule everyone, ray guns, death beams (both red and green) and a diaphanously clad beautiful moon princesses in love with the hero. - Summary by the author and phil chenevert