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Earth and the Moon orbit about their barycentre (common centre of mass), which lies about 4,670 km (2,900 mi) from Earth's centre (about 73% of its radius), forming a satellite system called the Earth–Moon system.
- Lunar orbit
In astronomy and spaceflight, a lunar orbit (also known as a...
- Moon
The Moon's orbit is slightly elliptical, with an orbital...
- Lunar node
The lunar nodes are the two points where the Moon's orbital...
- Lunar orbit
La Luna completa la sua orbita intorno alla Terra in circa 27,32 giorni ( mese siderale ). La Terra e la Luna orbitano attorno al loro baricentro (centro di massa comune) che si trova a circa 4.600 km dal centro della Terra (circa tre quarti del raggio terrestre ).
In astronomy and spaceflight, a lunar orbit (also known as a selenocentric orbit) is an orbit by an object around Earth's Moon. In general these orbits are not circular. When farthest from the Moon (at apoapsis ) a spacecraft is said to be at apolune , apocynthion , or aposelene .
The Moon's orbit is slightly elliptical, with an orbital eccentricity of 0.055. The semi-major axis of the geocentric lunar orbit, called the lunar distance, is approximately 400,000 km (250,000 miles or 1.28 light-seconds), comparable to going around Earth 9.5 times.
The lunar nodes are the two points where the Moon's orbital path crosses the ecliptic, the Sun's apparent yearly path on the celestial sphere. A lunar node is either of the two orbital nodes of the Moon, that is, the two points at which the orbit of the Moon intersects the ecliptic.
Selenocentric orbit (named after Selene): An orbit around Earth's Moon. Areocentric orbit (named after Ares): An orbit around the planet Mars, such as that of its moons or artificial satellites.
In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point.
