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In astronomy, the right ascension is the distance of a star or other heavenly body from the first point of Aries, or the point of intersection of the sun's path with the celestial equator. The right ascension, together with the declination of a star, fixes its position. Right ascension is stated in hours and minutes, fifteen degrees being equal to one hour.
 Research Right Ascension
A solstice is a point on the ecliptic midway between the equinoxes, where the sun, reversing its motion in declination, seems to stand still.
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In terrestrial magnetism, agonic line is a name applied to the line which joins all the places on the earth's surface at which the needle of the compass points due north and south, without any declination. This line varies from time to time.
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In astronomy, declination is the angular distance of a heavenly body north or south of the celestial equator (equinoctial), measured on a great circle passing through the pole and also through the body. If the body is north of the equator the declination is described as positive and if south negative. Parallels of declination are the circles parallel to the equator traversed by stars in their diurnal motion round the pole.
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A declinometer (declination needle) is an instrument for registering the amount and variation of magnetic declination.
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DEC is an abbreviation for Digital Equipment Corporation
DEC is an abbreviation for Declination
Research DEC
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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