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The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology , it has possible roots in older Babylonian astrology , and it is the origin of the names of the days of the week as used in English and numerous other languages.
This period is typically about 50 minutes longer than a 24-hour Earth day, as the Moon orbits the Earth in the same direction as the Earth's axial rotation. [ 2 ] The term lunar day is also used in the context of night and day, i.e., opposite to the lunar night.
Martin suggested that the conventional orrery should consist of three parts: the planetarium where the planets revolved around the Sun, the tellurion (also tellurian or tellurium) which showed the inclined axis of the Earth and how it revolved around the Sun, and the lunarium which showed the eccentric rotations of the Moon around the Earth. In ...
The modern interpretation of chart rulers is most often used though some astrologers will use both classical and modern rulers for reference when interpreting an individual's natal chart. Often in this case the inner planets (Mars, Saturn, and Jupiter) will be referenced as a chart's primary ruler while the outer planets (Uranus, Neptune, and ...
The astrological significance warrants the classification of the Sun and Moon separately from the planets, in that the Sun and Moon have to do with man's spiritual consciousness, while the planetary influences operate through the physical mechanism. The Moon is a luminary in the biblical sense that it affords to Man "light by night".
Directly above the 24-hour dial is the dial of the Primum Mobile, so called because it reproduces the diurnal motion of the stars and the annual motion of the sun against the background of stars. Each of the 'planetary' dials used complex clockwork to produce reasonably accurate models of the planets' motion.
For solid objects, such as rocky planets and asteroids, the rotation period is a single value.For gaseous or fluid bodies, such as stars and giant planets, the period of rotation varies from the object's equator to its pole due to a phenomenon called differential rotation.
The Ptolemaic system of planetary spheres asserts that the order of the heavenly bodies from the farthest to the closest to the Earth is Saturn, Jupiter, Mars, Sun, Venus, Mercury, and the Moon; objectively, the planets are ordered from slowest to fastest moving as they appear in the night sky. [5]