Darby has been an astrologer for more than half her life and is engaged in many layers of the astrological community. She taught at the Centre for Psychological Astrology from 1988 and lectures and teaches internationally. She has written several books: Astrology (with Lindsay Radermacher); The Astrological Moon; Water and Fire; and Earth and Air. She also co-authored The Mars Quartet with Lynn Bell, Liz Greene and Melanie Reinhart. Darby was awarded the MA in Cultural Astronomy and Astrology at Bath Spa University in 2006. She received the Charles Harvey Award in 2013. Her consultation practice is at the heart of her working life as an astrologer.