Earth–Moon barycenter

E821684

The Earth–Moon barycenter is the common center of mass around which both Earth and the Moon orbit in their mutual gravitational interaction.

All labels observed (1)

Label Occurrences
Earth–Moon barycenter canonical 2

How this entity was disambiguated

Statements (46)

Predicate Object
instanceOf astronomical concept
barycenter
center of mass
affects Earth orientation modeling
lunar orbit modeling
averageEarthMoonDistance_km about 384400
category Astrodynamics
linked to: Celestial Mechanics

Celestial mechanics
Orbital mechanics
coordinateSystemOriginFor some Earth–Moon dynamical models
definedBy mutual gravitational interaction of Earth and Moon
definedInFrame Newtonian mechanics
general relativity approximations
distanceFromEarthCenter_fractionOfRadius about 0.73
distanceFromEarthCenter_km about 4670
distanceFromEarthSurface_km about 1700
distanceFromMoonCenter_fractionOfDistance about 0.90 of average Earth–Moon distance
distanceFromMoonCenter_km about 379000
governedBy Newton’s law of gravitation
conservation of momentum
gravitationallyBoundSystem Earth–Moon
linked to: Earth–Moon system
hasProperty moves slightly due to perturbations from Sun and planets
not fixed within Earth due to varying Earth–Moon distance
hasSymbolicRepresentation often denoted as Earth–Moon CM or EM barycenter
isReferencePointFor barycentric dynamical time definitions (conceptually)
describing Earth and Moon orbits around each other
liesCloserTo Earth
liesOnLineBetween Earth center
Moon center
locatedInside Earth
massRatioEarthToMoon about 81.3 to 1
orbits solar system barycenter
orbitsWith Earth
Moon
orbitsWithPeriod about 27.3 days relative to stars
about 29.5 days relative to Sun
partOf Earth–Moon system
relatedTo center of mass
solar system barycenter
relevantFor Earth–Moon evolution models
tidal interaction studies
usedIn celestial mechanics
ephemeris calculations
orbital dynamics
solar system barycentric coordinates
spacecraft navigation

How these facts were elicited

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Earth–Moon system hasBarycenter Earth–Moon barycenter
SSB distinctFrom Earth–Moon barycenter