Omarr's first book was entitled "Sydney Omarr's Private Course on Numerology", which he self-published and sold for $2.00. While he wrote numerous books on the subject of astrology, including "My World of Astrology" and his autobiography "Answer in the Sky", he is probably the most widely known for his books on the popular sun sign astrology. This entailed a daily "Sun Sign Horoscope" column which appeared in more than 200 daily newspapers of the "Los Angeles Times" syndicate. Each year, Omarr wrote 12 annual forecasts – one for each sign of the zodiac and one overall book. These popular titles sold 50 million copies.