A sidereal system is used in Hindu astrology, and in some 20th century systems of Western astrology.
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After analyzing the history of cosmology, the treatise delves into the prevailing scientific lack of explanation of the rotation of the heavenly bodies in the laws of dynamic behaviour of the sidereal system.
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Walter Berg ( born 1947 ) is a British astrologer, known for his system of a 13-sign sidereal astrology ( 13 ), " a sidereal system that uses the actual star constellations of the true zodiac ".
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His life's work, " First attempt at a theory of the arrangement and motion of the sidereal system ", was published in 1922, and described a lens-shaped island universe of which the density decreased away from the center, now known as the " Kapteyn Universe ".
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Both divide the ecliptic into a number of " signs " named after constellations, but while the sidereal system defines the signs based on the fixed stars, the tropical system defines it based on the position of vernal equinox in the northern hemisphere ( i . e ., the intersection of the ecliptic with the celestial equator ).
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He waited until 1802 ( in " Catalogue of 500 new Nebulae, nebulous Stars, planetary Nebulae, and Clusters of Stars; with Remarks on the Construction of the Heavens " ) to announce the hypothesis that the two stars might be " binary sidereal systems " orbiting under mutual gravitational attraction, a hypothesis he confirmed in 1803 in his " Account of the Changes that have happened, during the last Twenty-five Years, in the relative Situation of Double-stars; with an Investigation of the Cause to which they are owing ".
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