Imum Coeli
Encyclopedia
In astrology
Astrology
Astrology consists of a number of belief systems which hold that there is a relationship between astronomical phenomena and events in the human world...

, the Imum Coeli (Latin for "bottom of the sky"), IC, is the point in space where the ecliptic
Ecliptic
The ecliptic is the plane of the earth's orbit around the sun. In more accurate terms, it is the intersection of the celestial sphere with the ecliptic plane, which is the geometric plane containing the mean orbit of the Earth around the Sun...

 crosses the meridian in the north, exactly opposite the Midheaven
Midheaven
The midheaven is a point of definition in the ecliptic coordinate system. It aims to find the part of the ecliptic that corresponds to the highest point in a celestial object's apparent daily traverse of the visible sky, midway between its ascension on the eastern horizon and descension on the...

. It marks the fourth house
Angular house
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...

 cusp
Cusp (astrology)
In astrology, a cusp is the imaginary line that separates a pair of consecutive signs in the zodiac or houses in the horoscope....

 in most house systems
House (astrology)
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 spheres of life, described in...

 (this is reversed in the southern hemisphere
Southern Hemisphere
The Southern Hemisphere is the part of Earth that lies south of the equator. The word hemisphere literally means 'half ball' or "half sphere"...

).

Astrological significance

The Imum Coeli is said to refer to our roots and also to the least conscious part of ourselves. It symbolizes foundations, beginnings in life, what may have been experienced through parental inheritance and homeland influences, need for security and relationships with the home and family life. It also may describe the circumstances that we will encounter at the end of our lives. Because this house was the most distant point possible from the visible part of the horoscope
Horoscope
In astrology, a horoscope is a chart or diagram representing the positions of the Sun, Moon, planets, the astrological aspects, and sensitive angles at the time of an event, such as the moment of a person's birth. The word horoscope is derived from Greek words meaning "a look at the hours" In...

, Hellenistic astrologers considered the IC to be the home of the underworld, or Hades
Hades
Hades , Hadēs, originally , Haidēs or , Aidēs , meaning "the unseen") was the ancient Greek god of the underworld. The genitive , Haidou, was an elision to denote locality: "[the house/dominion] of Hades". Eventually, the nominative came to designate the abode of the dead.In Greek mythology, Hades...

.

In many cases the IC refers to a parent — traditionally, the father
Father
A father, Pop, Dad, or Papa, is defined as a male parent of any type of offspring. The adjective "paternal" refers to father, parallel to "maternal" for mother...

. Modern astrologers may use the IC as a significator for the mother
Mother
A mother, mum, mom, momma, or mama is a woman who has raised a child, given birth to a child, and/or supplied the ovum that grew into a child. Because of the complexity and differences of a mother's social, cultural, and religious definitions and roles, it is challenging to specify a universally...

, or for both parents. There is no consensus in modern usage for which parent is best represented by the IC. The point is moot for Hellenistic astrologers who considered the fourth house
Angular house
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...

 the house of the father, but did not use the Imum Coeli as the cusp of the fourth house.

Using the natural houses system (see cadent houses) and modern quadrant house systems in which the IC is the cusp of the fourth house
Angular house
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...

, some modern astrologers see a correspondence between the fourth house and the astrological sign
Astrological sign
Astrological signs represent twelve equal segments or divisions of the zodiac. According to astrology, celestial phenomena reflect or govern human activity on the principle of "as above, so below", so that the twelve signs are held to represent twelve basic personality types or characteristic modes...

 Cancer
Cancer
Cancer , known medically as a malignant neoplasm, is a large group of different diseases, all involving unregulated cell growth. In cancer, cells divide and grow uncontrollably, forming malignant tumors, and invade nearby parts of the body. The cancer may also spread to more distant parts of the...

. However, traditional astrologers, using whole-sign houses, never made this connection.

In whole-sign house systems the signs and houses have the same boundaries; hence the Imum Coeli can actually appear in the third house, the fourth house
Angular house
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...

 or fifth house; in cases of extreme terrestrial latitude
Latitude
In geography, the latitude of a location on the Earth is the angular distance of that location south or north of the Equator. The latitude is an angle, and is usually measured in degrees . The equator has a latitude of 0°, the North pole has a latitude of 90° north , and the South pole has a...

, it may even fall in the second or sixth houses.
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