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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.
Animation showing equation of time and analemma path over one year.. The United States Naval Observatory states "the Equation of Time is the difference apparent solar time minus mean solar time", i.e. if the sun is ahead of the clock the sign is positive, and if the clock is ahead of the sun the sign is negative.
Computer astrology programs today typically make accurate planet position calculations, display and print these positions using astrological glyph symbols in graphic charts, save and retrieve individuals' data to and from database files, compare the planet positions of different charts to find the astrological aspects between them (e.g. for ...
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.
People around the world will have a chance this weekend to catch what could be the year’s most stunning view of the largest planet in our solar system.
For what it's worth, the Centers for Disease Control and Prevention has estimated that eight- to 10-year-olds clock in about six hours of screen time per day (on their phones or other devices), 11 ...
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]