Astrological sign

In Western astrology, astrological signs are the zodiac, twelve 30-degree sectors that are crossed by the Sun's 360-degree orbital path as viewed from Earth in its sky. The signs enumerate from the first day of spring, known as the First Point of Aries, which is the vernal equinox. The astrological signs are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. The Western zodiac originated in Babylonian astrology, and was later influenced by the Hellenistic culture. Each sign was named after a constellation the sun annually moved through while crossing the sky. This observation is emphasized in the simplified and popular sun sign astrology. Over the centuries, Western astrology's zodiacal divisions have shifted out of alignment with the constellations they were named after by axial precession of the Earth while Hindu astrology measurements correct for this shifting. Astrology was developed in Chinese and Tibetan cultures as well but these astrologies are not based upon the zodiac but deal with the whole sky.
Astrology is a pseudoscience. Scientific investigations of the theoretical basis and experimental verification of claims have shown it to have no scientific validity or explanatory power. More plausible explanations for the apparent correlation between personality traits and birth months exist, such as the influence of seasonal birth in humans.
According to astrology, celestial phenomena relate to human activity on the principle of "as above, so below", so that the signs are held to represent characteristic modes of expression. Scientific astronomy used the same sectors of the ecliptic as Western astrology until the 19th century.
Various approaches to measuring and dividing the sky are currently used by differing systems of astrology, although the tradition of the Zodiac's names and symbols remain mostly consistent. Western astrology measures from Equinox and Solstice points, while Hindu astrology measures along the equatorial plane.

Western zodiac signs

History

is a direct continuation of Hellenistic astrology as recorded in Ptolemy's Tetrabiblos in the 2nd century. Hellenistic astrology in turn was partly based on concepts from Babylonian tradition. Specifically, the division of the ecliptic in twelve equal sectors is a Babylonian conceptual construction. This division of the ecliptic originated in the Babylonian "ideal calendar" found in the old compendium MUL.APIN and its combination with the Babylonian lunar calendar, represented as the "path of the moon" in MUL.APIN. In a way, the zodiac is the idealisation of an ideal lunar calendar.
By the 4th century BC, Babylonian astronomy and its system of celestial omens influenced the culture of ancient Greece, as did the astronomy of Egypt by late 2nd century BC. This resulted, unlike the Mesopotamian tradition, in a strong focus on the birth chart of the individual and the creation of Horoscopic astrology, employing the use of the Ascendant, and of the twelve houses. Association of the astrological signs with Empedocles' four classical elements was another important development in the characterization of the twelve signs.
The body of the Hellenistic astrological tradition as it stood by the 2nd century is described in Ptolemy's Tetrabiblos. This is the seminal work for later astronomical tradition not only in the West but also in India and the Islamic sphere and has remained a reference for almost seventeen centuries as later traditions made few substantial changes to its core teachings.

Western astrological correspondence chart

The following table shows the approximate dates of the twelve astrological signs, along with the classical and modern rulerships of each sign. By definition, Aries starts at the First Point of Aries which is the location of the Sun at the March equinox. The precise date of the Equinox varies from year to year but is always between 19 March and 21 March. The consequence is the start date of Aries and therefore the start date of all the other signs can change slightly from year to year. The following Western astrology table enumerates the twelve divisions of celestial longitude with the Latin names. The longitude intervals, are treated as closed for the first endpoint and open for the second – for instance, 30° of longitude is the first point of Taurus, not part of Aries. The signs are occasionally numbered 0 through 11 in place of symbols in astronomical works.
The twelve signs are positioned in a circular pattern, creating a pattern of oppositions related to different philosophically polarized attributes. Fire and air elements are generally 180 degrees opposed in Western astrology, as well as earth and water elements. Not all systems of astrology have four elements, notably the Sepher Yetzirah describes only three elements emanating from a central divine source. Spring signs are opposite to autumn ones, winter signs are opposite to summer ones and vice versa.

Aries is opposite to Libra
Taurus is opposite to Scorpio
Gemini is opposite to Sagittarius
Cancer is opposite to Capricorn
Leo is opposite to Aquarius
Virgo is opposite to Pisces
Polarity

In Western astrology, the polarity divides the zodiac in half and refers to the alignment of a sign's energy as either positive or negative, with various attributes associated to them as a result. Positive polarity signs, also called active, yang, expressive, or masculine signs, are the six odd-numbered signs of the zodiac: Aries, Gemini, Leo, Libra, Sagittarius, and Aquarius. Positive signs make up the fire and air triplicities. Negative polarity signs, also called passive, yin, receptive, or feminine signs, are the six even-numbered signs of the zodiac: Taurus, Cancer, Virgo, Scorpio, Capricorn, and Pisces. Negative signs make up the earth and water triplicities.

The three modalities

The modality or mode of a given sign refers to its position in the season it is found in. Each of the four elements manifests in three modalities: ‘’’cardinal’’’, ‘’’fixed’’’, and ‘’’mutable’’’. Each modality comprehends four signs, also known as Quadruplicities. For example, the sign Aries is found in the first month of spring in the Northern Hemisphere, so practitioners of astrology describe it as having a cardinal modality. The combination of element and modality provides the signs with their unique characterizations. For instance, Capricorn is the cardinal earth sign, impressing its association with action in the material world.

Modality	3 primes	Alt. symbols	Keywords	Fire signs	Water signs	Air signs	Earth signs
Cardinal	file:Sulphur_symbol_.svg\|20px\|?		Action, dynamic, initiative, great force	Aries	Cancer	Libra	Capricorn
Fixed	file:Salt_symbol_.svg\|20px\|?		Resistance to change, great willpower, inflexible	Leo	Scorpio	Aquarius	Taurus
Mutable	file:Mercury_symbol_.svg\|20px\|☿		Adaptability, flexibility, resourcefulness	Sagittarius	Pisces	Gemini	Virgo

Triplicities of the four elements

The Greek philosopher Empedocles identified fire, earth, air, and water as elements in the fifth-century BC. He explained the nature of the universe as an interaction of two opposing principles, love and strife, which manipulate the elements into different mixtures that produce the different natures of things. He stated all the elements are equal, the same age, rule their own provinces, and possess their own individual character. Empedocles said that those born with nearly equal proportions of the elements are more intelligent and have the most exact perceptions.
The elemental categories are called triplicities because each classical element is associated with three signs The four astrological elements are also considered as a direct equivalent to Hippocrates' personality types. A modern approach looks at elements as "the energy substance of experience" and the next table tries to summarize their description through keywords. The elements have grown in importance and some astrologers begin natal chart interpretations by studying the balance of elements in the location of planets and the position of angles in the chart.

Polarity	Element	Symbol	Keywords	Sign triplicity
Positive	Fire		Assertion, drive, willpower	Aries, Leo, Sagittarius
Positive	Air		Communication, socialization, conceptualization	Gemini, Libra, Aquarius
Negative	Earth		Practicality, caution, material world	Taurus, Virgo, Capricorn
Negative	Water		Emotion, empathy, sensitivity	Cancer, Scorpio, Pisces

Celestial body rulerships

Rulership is the connection between planet and correlated sign and house. The conventional rulerships are as follows:

Aries: Mars
Taurus: Venus
Gemini: Mercury
Cancer: Moon
Leo: Sun
Virgo: Mercury
Libra: Venus
Scorpio: classically Mars, Pluto starting in the 20th century
Sagittarius: Jupiter
Capricorn: Saturn
Aquarius: classically Saturn, Uranus starting in the 20th century
Pisces: classically Jupiter, Neptune starting in the 20th century
Dignity and detriment, exaltation and fall

A traditional belief of astrology, known as essential dignity, is the idea that the Sun, Moon, and planets are more powerful and effective in some signs than others because the basic nature of both is held to be in harmony. By contrast, they are held to find some signs to be weak or difficult to operate in because their natures are thought to be in conflict. These categories are Dignity, Detriment, Exaltation, and Fall.

Dignity and Detriment: A planet is strengthened or dignified if it falls within the sign that it rules. In other words, it is said to exercise Rulership of the sign. For example, the Moon in Cancer is considered "strong". If a planet is in the sign opposite which it rules, it is said to be weakened or in Detriment. This may also be termed a "debility".

In traditional astrology, other levels of Dignity are recognised in addition to Rulership. These are known as Exaltation, Triplicity, Terms or bounds, and Face or Decan, which together are known as describing a planet's Essential dignity, the quality or ability of one's true nature.

Exaltation and Fall: A planet is also strengthened when it is in its sign of exaltation. In traditional horary astrology, this denotes a dignity just less than rulership. Exaltation was considered to give the planet's significance the dignity of an honoured guest: the centre of attention but constrained in power. Examples of planets in their Exaltation are: Saturn, Sun, Venus, Moon, Mercury, Mars, Jupiter. A planet in the opposite sign of this is in its fall, and thus weakened, perhaps more than Detriment. There is discord as to the signs in which the two extra-Saturnian planets may be considered to be exalted.

Planet	in dignity	in detriment	in exaltation	at fall
Sun	Leo	Aquarius	Aries	Libra
Moon	Cancer	Capricorn	Taurus	Scorpio
Mercury	Gemini and Virgo	Sagittarius and Pisces	Virgo	Pisces
Venus	Libra and Taurus	Aries and Scorpio	Pisces	Virgo
Mars	Aries and Scorpio	Libra and Taurus	Capricorn	Cancer
Jupiter	Sagittarius and Pisces	Gemini and Virgo	Cancer	Capricorn
Saturn	Capricorn and Aquarius	Cancer and Leo	Libra	Aries

In addition to essential dignity, the traditional astrologer considers Accidental dignity of planets. This is placement by house in the chart under examination. Accidental dignity is the planet's "ability to act". So we might have, for example, Moon in Cancer, dignified by rulership, is placed in the 12th house it would have little scope to express its good nature. The twelfth is a cadent house as are the third, sixth and ninth and planets in these houses are considered weak or afflicted. On the other hand, Moon in the first, fourth, seventh, or 10th would be more able to act as these are Angular houses. Planets in Succedent houses of the chart are generally considered to be of medium ability to act. Besides Accidental Dignity, there are a range of Accidental Debilities, such as retrogradation, Under the Sun's Beams, Combust, and so forth.