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Related to hemisphere: western hemisphere


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 ?
Goehl, EHP's editor-in-chief, says that, in addition to participating for purely altruistic reasons, the Northern Hemisphere journals also see this as a unique opportunity to help disseminate research and public health information being generated in Africa.
In our setup with these combined electron-proton detectors on both hemispheres, we are able to define two observable asymmetries:
It turns out that the bias in the right hemisphere is to process global information, and the bias in the left hemisphere is to process local.
Left hemisphere--lesion subjects presented with more general and severe memory deficits, compared with both controls and right hemisphere lesion subjects.
The population has benefited from years of strong investment from the United States: Trinidad and Tobago has the second highest level of US foreign capital investment in the Western Hemisphere, after Canada.
In terms of preparation and practice, we can learn a lot from northern hemisphere rugby.
Right Hemisphere is the most effective solution on the market we found to not only provide the translation and publishing infrastructure, but it also preserves the image quality 100 percent.
In the afternoon, the summit ends with the leaders of thirty-four Western Hemisphere nations signing the Quebec Declaration, endorsing a regional trade pact that calls for a hemisphere-wide free trade zone by 2005.
As I return home from Quebec City, I'm lugging a suitcase packed with well-developed critiques of free trade, many in multiple languages, from fellow activists throughout the hemisphere.
In fact, Ottawa has significant clout with several South American nations that are not so excited about freer trade in the hemisphere.
Winter in the Northern Hemisphere means it's summer way down under in Australia.
Without a strong Colombia, narco-traffickers will flourish, an abundant and steady flow of illicit drugs will head for the United States, one of our largest export markets in the Western Hemisphere will continue to falter, and a neighboring democratic government will further erode.