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The Part of Fortune marks the degree of your birth chart where material prosperity, physical wellbeing, and worldly luck naturally concentrate. One of the oldest sensitive points in astrology, dating to Hellenistic Egypt.
Deluxe Astrology's Part of Fortune calculator applies the Hellenistic day/night reversal formula using NASA JPL DE431 data — computing your true Fortuna point (ASC + Moon − Sun for day births; ASC + Sun − Moon for night births) rather than the simplified fixed formula used by most sites.
The Arabic Lots (also called Hermetic Lots) are among the oldest astrological techniques, documented in the Hellenistic texts of Paulus Alexandrinus, Vettius Valens, and later translated through Arab astrologers into the medieval tradition. The Lot of Fortune — Fortuna — was considered the most important of all, representing the body and its worldly circumstances. In your birth chart, Fortuna is not a planet but a mathematical point: the degree of the zodiac that holds the same angular relationship to the Ascendant that the Moon holds to the Sun. It is literally the Moon transposed onto the horizon, reframing physical life through the lens of instinctive need.
The most important technical distinction in calculating Fortuna correctly is the day/night reversal. Hellenistic astrologers grouped all chart factors by sect — day sect (Sun, Saturn, Jupiter) and night sect (Moon, Mars, Venus). The Lot of Fortune reverses its formula depending on which sect governs your birth: day births use ASC + Moon − Sun; night births use ASC + Sun − Moon. Many modern calculators skip this reversal entirely, producing incorrect results for half of all birth charts. The North Node and Vertex are companion points for understanding your soul's fated direction, while Fortuna focuses specifically on the material dimension of that path.
Reviewed by Ravi Khorana
Co-Founder, Deluxe Astrology. Vedic astrologer with expertise in Jyotish, Nakshatras, and Dasha systems.
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