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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.
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.
More exactly, sidereal time is the angle, measured along the celestial equator, from the observer's meridian to the great circle that passes through the March equinox (the northern hemisphere's vernal equinox) and both celestial poles, and is usually expressed in hours, minutes, and seconds.
The roots of the equatorium lie in the astrolabe.The history of the astrolabe dates back to roughly 220 BC in the works of Hipparchus. [6] The difference between the two instruments is that the astrolabe measures the time and position of the sun and stars at a specific location in time. [7]
Erie guitar player, 7, gathers 40 million views in 48 hours playing Metallica's 'One.' His dad is Ryan Krysiak, who plays bass for First to Eleven.
The program can calculate solar declination, Equation of Time, or Analemma; Doing calculations using Ptolemy's geocentric planetary models with a discussion of his E.T. graph; Equation of Time Longcase Clock by John Topping C.1720; The equation of time correction-table A page describing how to correct a clock to a sundial
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A Catholic nun with the Sisters of Charity Institute in Milan was among 25 people arrested early Thursday morning for a litany of mafia-related crimes, including aiding and abetting extortion ...
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