Kepler’s laws of planetary motion

E31644

Kepler’s laws of planetary motion are three fundamental principles that mathematically describe how planets orbit the Sun in ellipses, sweep out equal areas in equal times, and relate their orbital periods to their distances from the Sun.

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Statements (50)

Predicate Object
instanceOf astronomical law
physical law
physical law
physical law
set of physical laws
alsoKnownAs harmonic law
law of ellipses
law of equal areas
appliesTo exoplanets
objects in bound Keplerian orbits
planets in the Solar System
satellites
approximateFormulationStartYear 1605
approximatePublicationYear 1609
assumes Sun at or near focus of planetary orbits
two-body problem approximation
basedOn observations of Mars
observations of Tycho Brahe
describes relationship between orbital period and semi-major axis
shape of planetary orbits
variation of orbital speed
explainedBy Newton’s law of universal gravitation
field astronomy
astrophysics
celestial mechanics
formulatedBy Johannes Kepler
furtherPublicationYear 1619
historicalPeriod Scientific Revolution
implies conservation of angular momentum for orbital motion
involvesConcept areal velocity
ellipse
focus of an ellipse
orbital period
semi-major axis
mathematicalForm T^2 ∝ a^3
numberOfLaws 3
part Kepler’s first law
Kepler’s second law
Kepler’s third law
precededBy Copernican heliocentric model
linked to: Copernican system
publishedIn Astronomia nova
Harmonices Mundi
refinedBy Newtonian mechanics
statement A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
The orbit of every planet is an ellipse with the Sun at one of the foci.
The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.
usedFor calculating orbital periods
designing spacecraft trajectories
predicting planetary positions
relating orbital size to orbital period

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Referenced by (26)

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law of universal gravitation explains Kepler’s laws of planetary motion
law of universal gravitation inspiredBy Kepler’s laws of planetary motion
Johannes Kepler knownFor Kepler's laws of planetary motion
linked to: Kepler’s laws of planetary motion
Kepler’s laws of planetary motion part Kepler’s first law
linked to: Kepler’s laws of planetary motion
Kepler’s laws of planetary motion part Kepler’s second law
linked to: Kepler’s laws of planetary motion
Kepler’s laws of planetary motion part Kepler’s third law
linked to: Kepler’s laws of planetary motion
Kepler’s first law alsoKnownAs law of ellipses
linked to: Kepler’s laws of planetary motion
Kepler’s second law alsoKnownAs law of equal areas
linked to: Kepler’s laws of planetary motion
Kepler’s third law alsoKnownAs harmonic law
linked to: Kepler’s laws of planetary motion
Cosmos (book) influencedBy Kepler’s laws of planetary motion
Astronomia nova contains Kepler's first law of planetary motion
linked to: Kepler’s laws of planetary motion
Astronomia nova contains Kepler's second law of planetary motion
linked to: Kepler’s laws of planetary motion
Harmonices Mundi subject Kepler's laws of planetary motion
linked to: Kepler’s laws of planetary motion
Harmonices Mundi contains Kepler's third law of planetary motion
linked to: Kepler’s laws of planetary motion
Harmonices Mundi formulates Kepler's third law of planetary motion
linked to: Kepler’s laws of planetary motion
Epitome Astronomiae Copernicanae expoundsTheory Kepler's laws of planetary motion
linked to: Kepler’s laws of planetary motion
Rudolphine Tables uses Kepler's laws of planetary motion
linked to: Kepler’s laws of planetary motion
Aristotle’s On the Heavens challengedBy Johannes Kepler’s laws of planetary motion
linked to: Kepler’s laws of planetary motion
Book III (Principia) explains Kepler's laws of planetary motion
subject linked to: Book III
linked to: Kepler’s laws of planetary motion
Keplerian orbital elements relatedTo Kepler's laws of planetary motion
linked to: Kepler’s laws of planetary motion
Our Picture of the Universe discusses Kepler’s laws of planetary motion
Feynman’s Lost Lecture mainSubject Kepler’s laws of planetary motion
New Astronomy describes Kepler's second law of planetary motion
linked to: Kepler’s laws of planetary motion
Keplerian cosmology containsLaw Kepler’s second law of planetary motion
linked to: Kepler’s laws of planetary motion
Keplerian cosmology containsLaw Kepler’s third law of planetary motion
linked to: Kepler’s laws of planetary motion
Kepler Museum hasSubject Kepler’s laws of planetary motion