The study of the positions and aspects of celestial bodies in the belief that they have an influence on the course of natural earthly occurrences and human affairs.

It is also defined as a group of systems traditions and beliefs which hold that the relative positions of celestial bodies and related details can provide information about personality, human affairs and other earthly matters

Divination that consists of interpreting the influence of stars and planets on earthly affairs and human destinies. It originated in Mesopotamia (c. 3rd millennium BC) and spread to India, but it developed its Western form in Greek civilization during the Hellenistic period.

Astrology entered Islamic culture as part of the Greek tradition and was returned to European culture through Arabic learning during the Middle Ages. According to the Greek tradition, the heavens are divided according to the 12 constellations of the zodiac, and the bright stars that rise at intervals cast a spiritual influence over human affairs.

Astrology was also important in ancient China, and in imperial times it became standard practice to have a horoscope cast for each newborn child and at all decisive junctures of life. Though the Copernican system shattered the geocentric worldview that astrology requires, interest in astrology has continued into modern times and astrological signs are still widely believed to influence personality.

The application of astrology to medicine is called iatromathematica, was developed in Hellenistic Egypt.

Greek medicine and Greek astrology shared the predominant Aristotelian physics of the day: that everything was composed of the 4 elements of fire, air, water, and earth in varying proportions.

The 12 signs of the zodiac were divided into four groups of three, each group or triplicity being associated with one of these elements, whose qualities of heat, cold, dryness, and moisture they symbolized.

A particularly Egyptian feature was to give to each zodiac sign signification over certain parts and organs of the body
the first sign
Aries, signifying the head

Pisces, for the feet.

Moreover Hippocratic medicine held to constitute the human body as the elements composed the physical world as a whole, were assigned planetary significators, along with the organs which contained them

Jupiter ruled the blood, the liver, and the veins

The Moon, phlegm and the brain it also represented the humours as a whole

Mars, yellow bile and the gall bladder

Saturn black bile and the spleen.

While the Sun denoted the vital spirit of the body, radiating from the heart via the arteries.

Venus governed the genitourinary system, while to the seventh planet, Mercury, was given rulership of the mind.

Branches of astrology

Natal astrology
It is the study of a person's natal chart to gain information about the individual and their life experience.

Katarchic astrology
Itís a study about  electional and event astrology. The former uses astrology to determine the most auspicious moment to begin an enterprise or undertaking, and the latter to understand everything about an event from the time at which it took place.

Horary astrology
It is used to answer a specific question by studying the chart of the moment the question is posed to an astrologer.

Mundane or world astrology
It is the application of astrology to world events, including weather, earthquakes, and the rise and fall of empires or religions

The Islamic world  rejected the astrology during the 2nd millennium AD as they developed  the scientific method
al-Farabi, Alhacen, al-Biruni, Avicenna and Averroes, made semantic distinction between astronomy and astrology

Richard Dawkins and Stephen Hawking, regard astrology as unscientific

Astrophysicist Neil deGrasse Tyson says astrology was discredited 600 years ago with the birth of modern science.

Studies have failed to demonstrate statistically significant relationships between astrological predictions and operationally defined outcomes.
Effect size tests of astrology-based hypotheses conclude that the mean accuracy of astrological predictions is no greater than what is expected by chance.

While experimenting psychologists have suggested that several different psychological phenomena can contribute to perception of astrological accuracy. One, related to confirmation bias, is that people who are given a set of multiple predictions tend to remember more of the accurate predictions (hits) than the inaccurate ones (misses). Consequently people tend to recall the set of predictions as being more accurate than it actually was.

Michel Gauquelin a french psychologist and statistician attempt to demonstrate the validity of certain fundamentals of astrology he had found correlations between some planetary positions and certain human traits such as vocations.
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