He is considered the father of modern astrology: Alan Leo opened up the secrets of divination by the stars to the general public in the early 20th century with a popular line of astrology manuals that set off a craze for horoscopes that continues to this day.

This 1910 edition of one of his most fundamental reference works is an essential component of Leo's Astrology for All system, guiding the armchair astrologer through the minute interpretation of a cast horoscope, including.
. how rising signs and ruling planets influence each sign of the Zodiac
. how the Sun and Moon preside over each sign
. what the houses of the horoscope reveal about our prospects in marriage and business, friendship and health
. and more.

ALSO FROM COSIMO: Leo's Astrology for All, Symbolism and Astrology: An Introduction to Esoteric Astrology, Horary Astrology, and Mars: The War Lord

British astrologer WILLIAM FREDERICK ALLAN (1860-1917), aka Alan Leo, published Astrologer's Magazine as well as a line of astrological materials; he founded the Astrological Lodge of the Theosophical Society in 1915.