Tag: Astronomy,Mind of Lilith
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Arc of Vision
The least distance from the Sun at which a planet is visible when the Sun is below the horizon. Diurnal Arc. The arc through which the Sun passes from sunrise to sunset. At the Equinox this arc is 180°, or 12 hours of right ascension. With increased latitude (distance away from the Equator) and nearness to the Solstices it becomes larger or smaller. Nocturnal Arc. That portion of 360°, or 24 hours, which remains after subtracting the Diurnal Arc. Semi Arc. Diurnal and Nocturnal, Half of either the Nocturnal or Diurnal Arc, measured from the Midheaven or Imum Coeli to the horizon. Arc of Direction. The distance between a significator and the point where it forms an aspect with a promittor, measured in degrees and minutes of the Equator; distance from the place of a planet to the body of same, or to a point where an aspect will be formed thereto. It may be measured either in Sidereal Time according to Tables of Ascension, or in Right Ascension as computed by spherical trigonometry. In primary directions this Arc is translated into time in the proportion of one degree of arc to a year of time, or five minutes of arc to one month of time. (v. Directions.)
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Ascensional Difference
The difference between the Right Ascension of any body and its Oblique Ascension: used chiefly as expressing the difference in time between the rising or setting of a celestial body, and six o'clock; or, six hours from the meridianal passage. To find this, add the log. tangent of the declination of the planet, to the log. tangent of the latitude of the place. The sum will be the log. sine of the Ascensional Difference. This added to the planet's Right Ascension, when in South declination (or subtracted, when in North declination), gives the Oblique Ascension of the planet. The reverse process yields the Oblique Descension.
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Ascension, Signs of Long
Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius. (v. Signs.)
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Ascension
The vertical rising of a planet above the Ecliptic, equator or horizon. Right Ascension, the circle of declination reckoned toward the east from 0° Aries, measured in the plane of the Equator. Oblique Ascension, measured on the Prime Vertical. The Midheaven is directed by Right Ascension; the Ascendant by Oblique Ascension.
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Ascending Latitude
The increasing latitude of a planet moving toward the north pole of the Ecliptic.
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Armillary Sphere
A skeleton sphere suggested by concentric rings which represent the relative positions of the celestial circles of the equator and the ecliptic revolving within a horizon and meridian divided into degrees of longitude and latitude. It was invented by Eratosthenes (q.v.), who by this means computed the size of the Earth, and inclination of the ecliptic to the equator; also the latitude of the city of Alexandria. The armillary sphere is frequently used as a decoration, such as the beautiful specimen cast in bronze and supported on the shoulders of Atlas, which adorns the entrance to Rockerfeller Plaza in New York.
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