SAN FRANCISCO – Few people have heard of Gavin Arthur (1901–1972). Yet, he played a central role in modern astrology, the counterculture, and radical gay spirituality. He cast the horoscope that determined the date for the Human Be-In of 1967. An early advocate for gay liberation, Arthur was part of a chain linking Allen Ginsberg, Neal Cassidy, Edward Carpenter, and Walt Whitman. His grandfather was Chester A. Arthur, President of the US (1881-1885).