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In astrology, the Arabian/Arabic parts or lots are constructed points based on mathematical calculations of three horoscopic entities such as planets or angles. The distance between two of the points is added to the position of the third (very often the ascendant) to derive the location of the lot.
The lots are a very ancient astrological technique which can be traced back to pre-Hellenistic sources. Their origin is obscure; they could originally be Babylonian, Ancient Egyptian, Magian, Persian or Hermetic, but by the time of Dorotheus of Sidon in the first century A.D. (and probably earlier) they had become an established tenet of Hellenistic astrological practice.
One of the best informational sources for the lots is the Introduction to astrology by fourth-century astrologer Paulus Alexandrinus and the Commentary on this work by sixth-century philosopher Olympiodorus the Younger. Paulus used a dozen or so major lots for almost every aspect of his analysis. The most important of these were the Lot of Fortune (or Part of Fortune) and its complement, the Lot of Spirit.
After the fall of the Roman Empire, all of the classical legacy, including astrology, fell to the Abbasid Arabs and Persians. Arab astrologers translated sources from Greek and produced many of their own astrologers who wrote a considerable amount in Arabic on astrology. Although it is not clear whether the number of lots began to proliferate in late Antiquity or whether it was purely the product of the fascination the Arabs had for them, Arabic manuscripts show an explosion in the number of lots that were used over the next several centuries. The inordinate increase is noted by the Arab commentators themselves. In The Abbreviation of the Introduction to Astrology, Persian astrologer Abu Ma'shar al-Balkhi (787-886) describes no less than 55 lots, although it's clear that these are only the ones he considers significant. [1] This count does not even include all of the lots of Paulus.
Beginning in the tenth century, many Arabic manuscripts were translated into Latin, becoming the means by which Classical astrology found its way back to Europe. Medieval astrologers, most notably the major 13th-century Italian, Guido Bonatti, a contemporary of Dante, assumed it was the Arabs who originated the concept of the lots, and hence they came eventually to be called the "Arabic parts".
By the time of William Lilly (XVII century), only the Lot of Fortune continued to be used by astrologers, although in a manner that would be considered strange by ancient practitioners. Lilly's methods with what he called "Fortuna" have continued in modern astrology, although rarely used and usually misunderstood. The Lot of Fortune mainly appears today in horary practice.
Lilly's Part of Fortune (or Pars Fortunae) is calculated as Ascendant + Moon - Sun. That is, the degrees of distance (going in the direction of the signs) between the Sun and the Moon is calculated and then that same distance is measured from the point of the ascendant.
The same procedure was used by the Arabs and by Hellenistic astrologers to calculate the Lot of Fortune but there were two major differences:
The symbol for the Lot of Fortune is 
(U+1F774 🝴).
If the Lot of Fortune deals with material well-being, the body, fortune and health, the Lot of Spirit represents the initiative taken by that person, or what use is made of what is given.
The Lot of Spirit is the reverse of the Lot of Fortune, giving the following formulas:
The Hermetic lots are a specific set of seven lots, each associated with one of the seven visible planets (including the Sun and Moon), that were attributed to the figure Hermes Trismegistus in the Hellenistic tradition of astrology. [2] This set of lots appears in the work of the 4th century astrologer Paulus Alexandrinus, as well as in his later commentator Olympiodorus the Younger. The formulas for the lots can be found in Paulus (see reference below).
The formulas for the Hermetic lots later made their way into the Medieval astrological tradition where they appear in authors such as Abu Ma'shar al-Balkhi and Guido Bonatti, although their lists have been combined with an alternate lot tradition derived from the 2nd century astrologer Vettius Valens.
Western astrology is the system of astrology most popular in Western countries. Western astrology is historically based on Ptolemy's Tetrabiblos, which in turn was a continuation of Hellenistic and ultimately Babylonian traditions.
Most horoscopic traditions of astrology systems divide the horoscope into a number of houses whose positions depend on time and location rather than on date. In Hindu astrological tradition these are known as Bhāvas. The houses of the horoscope represent different fields of experience wherein the energies of the signs and planets operate—described in terms of physical surroundings as well as personal life experiences.
Astrological belief in correspondences between celestial observations and terrestrial events have influenced various aspects of human history, including world-views, language and many elements of social culture.
Abu Ma'shar al-Balkhi, Latinized as Albumasar, was an early Persian Muslim astrologer, thought to be the greatest astrologer of the Abbasid court in Baghdad. While he was not a major innovator, his practical manuals for training astrologers profoundly influenced Muslim intellectual history and, through translations, that of western Europe and Byzantium.
Astrology has used the concept of classical elements from antiquity up until the present. In Western astrology and Sidereal astrology four elements are used: Fire, Earth, Air, and Water.
Māshāʾallāh ibn Atharī, known as Mashallah, was an 8th century Persian Jewish astrologer, astronomer, and mathematician. Originally from Khorasan, he lived in Basra during the reigns of the Abbasid caliphs al-Manṣūr and al-Ma’mūn, and was among those who introduced astrology and astronomy to Baghdad. The bibliographer ibn al-Nadim described Mashallah "as virtuous and in his time a leader in the science of jurisprudence, i.e. the science of judgments of the stars". Mashallah served as a court astrologer for the Abbasid caliphate and wrote works on astrology in Arabic. Some Latin translations survive.
Essential dignity, in the context of an astrological horoscope or natal chart, refers to the relative “strength” or “weakness” of a planet based on its zodiac sign and specific degree. This strength or weakness is referred to as the planet’s essence—what the 17th-century astrologer William Lilly called "the strength, fortitude or debility of the Planets [or] significators."
In astrology, an angular house, or cardinal house, is one of four cardinal houses of the horoscope, which are the houses in which the angles of the chart are found. The angular houses of the horoscope are considered to be the most ardent, or forceful, and are considered to have the greatest impact in the chart. The influential 17th-century astrologer William Lilly states simply: "Planets in angles do more forcibly show their effects." Angular houses rule those critical things in our life, such as our appearance and how we behave, our family life, our married life or partnerships, and our career.
In astrology, a cadent house is the last house of each quadrant of the zodiac. A quadrant begins with an Angular house, proceeds to a succedent house and ends with a cadent house. There are four quadrants in an astrological chart, providing four angular, four succedent, and four cadent houses.
In astrology, a triplicity is a group of three signs belonging to the same element.
Paulus Alexandrinus was an astrological author from the late Roman Empire. His extant work, Eisagogika, or Introductory Matters, which was written in 378 AD, is a treatment of major topics in astrology as practiced in the fourth century Roman Empire.
Rhetorius of Egypt was the last major classical astrologer from whom we have any excerpts. He lived in the sixth or early seventh century, in the early Byzantine era. He wrote an extensive compendium in Greek of the techniques of the Hellenistic astrologers who preceded him, and is one of our best sources for the work of Antiochus of Athens. Although no intact original manuscript survives of his work, we do have several late Byzantine versions of it.
Hephaestion, Hephaistion, or Hephaistio of Thebes was a Hellenized Egyptian astrologer of late Antiquity who wrote a Greek treatise known as the Apotelesmatics or Apotelesmatika around AD 415. Much of the work appears to be an attempt to synthesize the earlier works of the 1st century astrologer Dorotheus of Sidon and the 2nd century astrologer Claudius Ptolemy. Hephaestion is seen mainly as one of the later compilers of the Hellenistic tradition of astrology since he mainly draws from earlier astrologers, including Antiochus of Athens, and he summarizes large portions of Ptolemy and Dorotheus, which is helpful to modern scholars since we have no other record of many of the authorities that he quotes.
Olympiodorus the Younger was a Neoplatonist philosopher, astrologer and teacher who lived in the early years of the Byzantine Empire, after Justinian's Decree of 529 AD which closed Plato's Academy in Athens and other pagan schools. Olympiodorus was the last pagan to maintain the Platonist tradition in Alexandria ; after his death the School passed into the hands of Christian Aristotelians, and was eventually moved to Constantinople. He is not to be confused with Olympiodorus the Deacon, a contemporary Alexandrian writer of Bible commentaries.
Horoscopic astrology is a form of astrology that uses a horoscope, a visual representation of the heavens, for a specific moment in time to interpret the purported meaning behind the alignment of the planets at that moment. The idea is that the placement of the planets at any given moment in time supposedly reflects the nature of that moment and especially anything that is born then, and proponents claim that this can be analyzed using the chart and a variety of rules for interpreting the "language" or symbols therein.
Guido Bonatti was an Italian mathematician, astronomer and astrologer, who was the most celebrated astrologer of the 13th century. Bonatti was advisor of Frederick II, Holy Roman Emperor, Ezzelino da Romano III, Guido Novello da Polenta and Guido I da Montefeltro. He also served the communal governments of Florence, Siena and Forlì. His employers were all Ghibellines, who were in conflict with the Guelphs, and all were excommunicated at some time or another. Bonatti's astrological reputation was also criticised in Dante's Divine Comedy, where he is depicted as residing in hell as punishment for his astrology.
Succedent house is an astrological term for the houses that follow the angular houses in an Astrological chart. “Succedent” derives from the Latin succedens meaning "subsequent" or "succeeding". Since the angular houses are the first, fourth, seventh and tenth houses, the succedent houses are the second, fifth, eighth, and eleventh houses.
Hellenistic astrology is a tradition of horoscopic astrology that was developed and practiced in the late Hellenistic period in and around the Mediterranean Basin region, especially in Egypt. The texts and technical terminology of this tradition of astrology were largely written in Greek. The tradition originated sometime around the late 2nd or early 1st century BCE, and then was practiced until the 6th or 7th century CE. This type of astrology is commonly referred to as "Hellenistic astrology" because it was developed in the late Hellenistic period, although it continued to be practiced for several centuries after the end of what historians usually classify as the Hellenistic era.
Some medieval Muslims took a keen interest in the study of astrology, despite the Islamic prohibitions partly because they considered the celestial bodies to be essential, partly because the dwellers of desert-regions often travelled at night, and relied upon knowledge of the constellations for guidance in their journeys. After the advent of Islam, the Muslims needed to determine the time of the prayers, the direction of the Kaaba, and the correct orientation of the mosque, all of which helped give a religious impetus to the study of astronomy and contributed towards the belief that the heavenly bodies were influential upon terrestrial affairs as well as the human condition. The science dealing with such influences was termed astrology, a discipline contained within the field of astronomy. The principles of these studies were rooted in Arabian, Persian, Babylonian, Hellenistic and Indian traditions and both were developed by the Arabs following their establishment of a magnificent observatory and library of astronomical and astrological texts at Baghdad in the 8th century.