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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(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.
The Astrology Book, Second Edition © 2003 Visible Ink Press®. All rights reserved.


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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the present case, MRI studies revealed a PRES depiction involving only the cerebellar hemispheres. Isolated cerebellar involvement in the setting of PRES is extremely rare [15].
The effects of cTBS might be not as spatially specific as those of discrete lesions due to the current spread; it is thus possible that cTBS delivered on the left cerebellar hemisphere had an effect on the contralateral hemisphere as well.
A correlative proton MR Spectroscopy (1H MRS) exam was performed on the abnormal area in the right superior cerebellar hemisphere using both short and long echo times (TE) of 144 and 35 ms, respectively (Figure 2).
We present a case of NCC in a buddust's cerebellar hemisphere, who underwent a craniectomy treatment under the suspected diagnosis with negative indirect hemagglutination test.
Cranial MRI showed atrophy of left cerebral and right cerebellar hemisphere (Figure 1, 2, 3).
Magnetic resonance imaging (Figure 1) revealed an acute infarction in the left cerebellar tonsil, left cerebellar hemisphere, and left medullary restiform body, in the territory of the left posterior inferior cerebellar artery (PICA).
A brain MRI revealed mild cerebellar volume loss and T2 hyperintensity predominantly in the right more than in the left cerebellar hemisphere and tegmental pons.
Caption: FIGURE 1: Echography on day 3 showing a high echoic lesion in the cerebellar hemisphere (a, black asterisks).
Caption: FIGURE 1: MRI ((a) and (b)) showed multiple infarcts in the bilateral cerebellum especially in the right cerebellar hemisphere. Frontal and lateral DSA ((c) and (d)) of left VA angiogram showed the dissection in the segment of V3.
A repeat CT scan of the brain (Figure 2) on day 5 demonstrated development of extensive white matter abnormality predominantly within the frontoparietal lobes of the cerebrum bilaterally with mild white matter abnormality within the occipital lobes and left cerebellar hemisphere. There was no evidence of acute hemorrhage or mass effect and there was relative sparing of the basal ganglia, internal capsules, brain stem and the gray matter.
Magnetic resonance imaging (MRI) was carried out and demonstrated high signal intensity areas on T2-weighted and FLAIR images bilaterally and symmetrically in the paramedian thalami, mesencephalothalamic junction, right anterior, posterosuperior cerebellar hemisphere, and the left occipital lobe.