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In astronomy, coordinate systems are used for specifying positions of celestial objects (satellites, planets, stars, galaxies, etc.) relative to a given reference frame, based on physical reference points available to a situated observer (e.g. the true horizon and north to an observer on Earth's surface). [1]
Planetary coordinate system. Chart of lunar maria with lines of longitude and latitude. The prime meridian is the centre of the near side of the Moon. A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) [1][2] is a generalization of the geographic, geodetic, and the geocentric coordinate systems ...
Astrolog is an open-source astrological software program that has been available online free of charge since 1991. It has been (as of 2024) authored by Walter Pullen since its creation, and was originally distributed via postings to the Usenet newsgroup alt.astrology. Astrolog can create horoscopes, natal charts, and calculate current planetary ...
In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ə r ə s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛ r ə d iː z /; from Latin ephemeris 'diary' and Greek ἐφημερίς (ephemeris) 'diary, journal') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and ...
The moons Io, Ganymede, Europa, and Titan are visible. A great conjunction is a conjunction of the planets Jupiter and Saturn, when the two planets appear closest together in the sky. Great conjunctions occur approximately every 20 years when Jupiter "overtakes" Saturn in its orbit.
The inner Solar System is the region comprising the terrestrial planets and the asteroids. [ 89 ] Composed mainly of silicates and metals, [ 90 ] the objects of the inner Solar System are relatively close to the Sun; the radius of this entire region is less than the distance between the orbits of Jupiter and Saturn.
List of conjunctions (astronomy) - Wikipedia. Conjunction of Mercury and Venus, appearing above the Moon, at the Paranal Observatory. This is a list of the Solar System 's recent planetary conjunctions (in other words, when two planets look close together) for the period 2005–2020. In astronomy, a conjunction is an event, defined only when ...
In astrology, planets have a meaning different from the astronomical understanding of what a planet is.Before the age of telescopes, the night sky was thought to consist of two similar components: fixed stars, which remained motionless in relation to each other, and moving objects/"wandering stars" (Ancient Greek: ἀστέρες πλανῆται, romanized: asteres planetai), which moved ...