80 relations: Altitude, Angular momentum, Aphrodite, Apollo program, Apse, Apsidal precession, Ares, Arithmetic mean, Artemis, Astronomical object, Astronomical unit, Axial precession, Barycenter, Black hole, Bothros, Center of mass, Ceres (dwarf planet), Cognate, Conic section, Coordinated Universal Time, Cronus, December solstice, Dwarf planet, Earth, Eccentric anomaly, Ecliptic, Ellipse, Elliptic orbit, Eris (dwarf planet), Formula, Gaia, Galaxy, Geocentric orbit, Geoffrey A. Landis, Geometric mean, Hades, Halley's Comet, Haumea, Helios, Hermes, June solstice, Jupiter, Kepler's laws of planetary motion, Longitude of the periapsis, Luna (goddess), Lunar orbit, Makemake, March equinox, Mars, Mercury (planet), ..., Milankovitch cycles, Moon, Neptune, Orbit, Orbital eccentricity, Orbital elements, Orbital mechanics, Outer planets, Perifocal coordinate system, Perihelion and aphelion, Physical body, Planet, Pluto, Poseidon, Primary (astronomy), Saturn, Selene, Semi-major and semi-minor axes, Similarity (geometry), Solar System, Solstice, Spacecraft, Specific orbital energy, Specific relative angular momentum, Standard gravitational parameter, Star, Sun, Uranus, Venus, Zeus. Expand index (30 more) » « Shrink index
Altitude or height (sometimes known as depth) is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, atmospheric pressure, and many more).
In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational equivalent of linear momentum.
Aphrodite is the ancient Greek goddess of love, beauty, pleasure, and procreation.
The Apollo program, also known as Project Apollo, was the third United States human spaceflight program carried out by the National Aeronautics and Space Administration (NASA), which accomplished landing the first humans on the Moon from 1969 to 1972.
In architecture, an apse (plural apses; from Latin absis: "arch, vault" from Greek ἀψίς apsis "arch"; sometimes written apsis, plural apsides) is a semicircular recess covered with a hemispherical vault or semi-dome, also known as an Exedra.
In celestial mechanics, apsidal precession or orbital precession is the precession (rotation) of the orbit of a celestial body.
Ares (Ἄρης, Áres) is the Greek god of war.
In mathematics and statistics, the arithmetic mean (stress on third syllable of "arithmetic"), or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection.
Artemis (Ἄρτεμις Artemis) was one of the most widely venerated of the Ancient Greek deities.
An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis.
The barycenter (or barycentre; from the Ancient Greek βαρύς heavy + κέντρον centre) is the center of mass of two or more bodies that are orbiting each other, which is the point around which they both orbit.
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.
Bothros (Greek βόθρος, plural bothroi) is the Ancient Greek word for "hole", "pit" or "trench".
In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero, or the point where if a force is applied it moves in the direction of the force without rotating.
Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter, slightly closer to Mars' orbit.
In linguistics, cognates are words that have a common etymological origin.
In mathematics, a conic section (or simply conic) is a curve obtained as the intersection of the surface of a cone with a plane.
In Greek mythology, Cronus, Cronos, or Kronos (or from Κρόνος, Krónos), was the leader and youngest of the first generation of Titans, the divine descendants of Uranus, the sky, and Gaia, the earth.
The December solstice, also known as the southern solstice, is the solstice that occurs each December, typically between the 20th and the 22nd day of the month according to the Gregorian calendar.
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
In orbital mechanics, eccentric anomaly is an angular parameter that defines the position of a body that is moving along an elliptic Kepler orbit.
The ecliptic is the circular path on the celestial sphere that the Sun follows over the course of a year; it is the basis of the ecliptic coordinate system.
In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.
In astrodynamics or celestial mechanics, an elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with eccentricity equal to 0.
Eris (minor-planet designation 136199 Eris) is the most massive and second-largest (by volume) dwarf planet in the known Solar System.
In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a chemical formula.
In Greek mythology, Gaia (or; from Ancient Greek Γαῖα, a poetical form of Γῆ Gē, "land" or "earth"), also spelled Gaea, is the personification of the Earth and one of the Greek primordial deities.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
A geocentric orbit or Earth orbit involves any object orbiting Planet Earth, such as the Moon or artificial satellites.
Geoffrey Alan Landis (born May 28, 1955) is an American scientist, working for the National Aeronautics and Space Administration (NASA) on planetary exploration, interstellar propulsion, solar power and photovoltaics.
In mathematics, the geometric mean is a mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).
Hades (ᾍδης Háidēs) was the ancient Greek chthonic god of the underworld, which eventually took his name.
Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 74–79 years.
Haumea, minor-planet designation 136108 Haumea, is a dwarf planet located beyond Neptune's orbit.
Helios (Ἥλιος Hēlios; Latinized as Helius; Ἠέλιος in Homeric Greek) is the god and personification of the Sun in Greek mythology.
Hermes (Ἑρμῆς) is an Olympian god in Greek religion and mythology, the son of Zeus and the Pleiad Maia, and the second youngest of the Olympian gods (Dionysus being the youngest).
The June solstice, also known as the northern solstice, is the solstice on the Earth that occurs each June falling on the 20th to 22nd according to the Gregorian calendar.
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
In astronomy, Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
In celestial mechanics, the longitude of the periapsis, also called longitude of the pericenter, of an orbiting body is the longitude (measured from the point of the vernal equinox) at which the periapsis (closest approach to the central body) would occur if the body's orbit inclination were zero.
In ancient Roman religion and myth, Luna is the divine embodiment of the Moon (Latin luna; cf. English "lunar").
In astronomy, lunar orbit (also known as a selenocentric orbit) is the orbit of an object around the Moon.
Makemake (minor-planet designation 136472 Makemake) is a dwarf planet and perhaps the largest Kuiper belt object in the classical population, with a diameter approximately two thirds that of Pluto.
The March equinox or Northward equinox is the equinox on the Earth when the subsolar point appears to leave the southern hemisphere and cross the celestial equator, heading northward as seen from Earth.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
Mercury is the smallest and innermost planet in the Solar System.
Milankovitch cycles describe the collective effects of changes in the Earth's movements on its climate over thousands of years.
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
Orbital elements are the parameters required to uniquely identify a specific orbit.
Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
The outer planets are those planets in the Solar System beyond the asteroid belt, and hence refers to the gas giants and ice giants, which are in order of their distance from the Sun.
The perifocal coordinate (PQW) system is a frame of reference for an orbit.
The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.
In physics, a physical body or physical object (or simply a body or object) is an identifiable collection of matter, which may be constrained by an identifiable boundary, and may move as a unit by translation or rotation, in 3-dimensional space.
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.
Poseidon (Ποσειδῶν) was one of the Twelve Olympians in ancient Greek religion and myth.
A primary (also called a gravitational primary, primary body, or central body) is the main physical body of a gravitationally bound, multi-object system.
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
In Greek mythology, Selene ("Moon") is the goddess of the moon.
In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.
Two geometrical objects are called similar if they both have the same shape, or one has the same shape as the mirror image of the other.
The Solar SystemCapitalization of the name varies.
A solstice is an event occurring when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere.
A spacecraft is a vehicle or machine designed to fly in outer space.
In the gravitational two-body problem, the specific orbital energy \epsilon\,\! (or vis-viva energy) of two orbiting bodies is the constant sum of their mutual potential energy (\epsilon_p\,\!) and their total kinetic energy (\epsilon_k\,\!), divided by the reduced mass.
In celestial mechanics the specific relative angular momentum \vec plays a pivotal role in the analysis of the two-body problem.
In celestial mechanics, the standard gravitational parameter μ of a celestial body is the product of the gravitational constant G and the mass M of the body.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
The Sun is the star at the center of the Solar System.
Uranus is the seventh planet from the Sun.
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
Zeus (Ζεύς, Zeús) is the sky and thunder god in ancient Greek religion, who rules as king of the gods of Mount Olympus.
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