What is Arabic Parts (Hellenistic Lots)?
Arabic Parts (or Lots) are sensitive points calculated by adding two planets and subtracting a third, with the formula reversed in night charts to account for sect. The most famous is the Part of Fortune (Asc + Moon − Sun day; Asc + Sun − Moon night), representing material prosperity and physical well-being. Other notable parts include the Part of Spirit (career and action), Part of Eros (desire and sexuality), Part of Necessity (constraint and obligation), and dozens of others for specific life domains. Each part's sign and house indicate where that life domain flows most naturally. Classical astrologers assigned high authority to Arabic Parts; modern Western astrology often overlooks them.