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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 ?
The CT scan showed two cysts mass in the left cerebellar hemisphere (Fig.
The superior petrosal vein mainly collects venous blood from cerebellar hemisphere and lateral pons.
The tumour maybe located medially in the vermis or laterally in the cerebellar hemisphere.
Out of 14 SLE patients who had seizures, 9 had white matter hyperintensities; seven had isolated white matter hyperintensities, one had combination of white matter hyperintensities plus hyperintensities in corpus callosum and right middle cerebellar peduncle, and one patient had combination of white matter hyperintensities and hyperintensities in paramedian cerebellar hemispheres with mild brain atrophy.
Seven single voxels, approximately 8 cc in volume, were positioned within the medial frontal gray matter, the left frontal white matter, left parietal white matter, the right temporal lobe at the superior temporal gyrus, the left basal ganglia, left cerebellar hemisphere (gray and white matter), and the cerebellar vermis, respectively (Figure 1).
These lesions involved the supra- and the infratentorial compartments, with the largest lesion in the left cerebellar hemisphere (Figure 1A).
Magnetic resonance imaging revealed compression of the right cerebellar hemisphere, decreased flow through the sigmoid sinus, and tumor extending into the middle cranial fossa toward the temporal lobe (figure 1).
There were more extensive contrast-enhanced lesions in the right cerebellar hemisphere than the first MRI examination [Figure 1]e.
In another patients shows in NCCT as ill-defined isodense mass lesion in the right cerebellar hemisphere with mass effect compression effacement of 4th ventricle (Fig.
CT scan and Magnetic Resonance Imaging (MRI) of the brain revealed multiple hematomas in left frontal and high parietal lobe, in right cerebellar hemisphere, downward tonsillar herniation and indentation of the posterior eyeball suggestive of raised intracranial tension.