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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.
All planets are close to their host star: LHS 1678 b, c and d have orbital periods of about 21 hours, 3.7 and 5 days respectively. LHS 1678 c and d are close to a 4:3 orbital resonance , meaning that for every four orbits completed by LHS 1678 c, LHS 1678 d completes three orbits.
The Rudolphine Tables (Latin: Tabulae Rudolphinae) consist of a star catalogue and planetary tables published by Johannes Kepler in 1627, using observational data collected by Tycho Brahe (1546–1601). The tables are named in memory of Rudolf II, Holy Roman Emperor, in whose employ Brahe and Kepler had begun work on the tables.
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
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 28 Lunar Mansions, or more precisely lodgings (Chinese: 二十 八 宿; pinyin: èrshí bā xiù) are the Chinese and East Asian form of the lunar stations. They can be considered as the equivalent to the Western zodiac, although the 28 stations reflect the movement of the Moon through a sidereal month rather than the Sun in a tropical year; (cf. Solar term).
In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ər ɪ s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛr ɪ ˌ d iː z /; from Latin ephemeris 'diary', from Ancient Greek ἐφημερίς (ephēmerís) 'diary, journal') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position ...
Calculate time intervals, subtract the times between observations: ... (it and its vector, r 2, are in the Equatorial Coordinate System), ...