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1. one half of a sphere
a. half of the terrestrial globe, divided into northern and southern hemispheres by the equator or into eastern and western hemispheres by some meridians, usually 0° and 180°
b. a map or projection of one of the hemispheres
3. either of the two halves of the celestial sphere that lie north or south of the celestial equator
4. Anatomy short for cerebral hemisphere


(religion, spiritualism, and occult)

Hemisphere literally means a half sphere. In geography, hemisphere refers to the division of Earth into northern, southern, eastern, and western hemispheres. In astrology, hemisphere usually refers to the division of a horoscope into upper and lower halves (using the ascendant-descendant axis as the dividing line) or into left and right halves (using the midheaven-imum coeli axis as the dividing line). The upper and lower hemispheres of a chart are technically termed the diurnal (day, because it is above the horizon) arc and the nocturnal (night, because it is below the horizon) arc, respectively. The left and right hemispheres are termed the oriental (eastern) arc and the occidental (western) arc. These technical terms are rarely used by contemporary astrologers.

In the interpretation of a natal chart, the occurence of many planets above the horizon is said to indicate extroversion; many planets below the horizon indicates introversion. Also, a chart with a preponderance of planets in the left hemisphere is said to indicate an individual who shapes her or his environment, and a preponderance in the right hemisphere indicates an individual who adapts to the environment. These interpretations are tentative, “first impression” delineations and can be quickly abandoned if other factors in a birth chart give contrary indications.


Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New York: New American Library, 1980.
Gettings, Fred. Dictionary of Astrology. London: Routledge & Kegan Paul, 1985.


A half of the earth divided into north and south sections by the equator, or into an east section containing Europe, Asia, and Africa, and a west section containing the Americas.
One of the two pieces of a sphere divided by a great circle.
References in periodicals archive ?
London, May 17 ( ANI ): Black carbon aerosols and tropospheric ozone, both manmade pollutants emitted predominantly in the Northern Hemisphere's low-to mid-latitudes, are most likely pushing the boundary of the tropics further poleward in that hemisphere, a new study has revealed.
McGilchrist's research on the basis of which he confronts the nihilism of our culture is focussed on the lateralization of the brain and the different functions of the different hemispheres.
The Northern and Southern hemispheres are separated by the equator.
With few exceptions, results in games between teams of the two hemispheres over the last three to four years emphatically demonstrate these realities.
It is Ben Sangster's intention to increase his bloodstock interests in the northern hemisphere as is Adam's in the southern hemisphere.
Regardless of philosophical differences, Feinberg notes, evidence suggests that the brain's right hemisphere often orchestrates basic knowledge about one's self, just as the left hemisphere usually assumes primary responsibility for language.
The Northern Hemispheres journals will benefit too.
In our setup with these combined electron-proton detectors on both hemispheres, we are able to define two observable asymmetries:
Consider this analogy: In the early 1960s, Roger Sperry and Ronald Meyers discovered the split-brain effect, in which the two hemispheres of the brain are responsible for different modes of thought and action.
These cases provide dramatic evidence that the hemispheres differ in fundamental ways.
This year, they're holding the Summer Olympics here in Sydney in late September, so the weather will be warm in both the Northern and Southern Hemispheres.
But now, the brain's left and right (intuitive) hemispheres are suddenly called upon to work in tandem.