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Equant - Wikipedia Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets The equant is used to explain the observed speed change in different stages of the planetary orbit
Equant | astronomy | Britannica The equant is the point from which each body sweeps out equal angles along the deferent in equal times The centre of the deferent is midway between the equant and Earth
Ptolemys Equant - Keplers Discovery The "equant" is an imaginary mathematical point that "sees" the planet move at a uniform angular speed Because it is not located in the center of the orbit it "causes" the planet's actual speed on the orbit to change
An Interesting Property of the Equant In the concentric equant model the Earth is at the center O of a deferent of radius R and the planet is at S on the deferent The motion of S is uniform as seem from the equant point E, which is a distance e from O
What are epicycles, deferents, eccentrics, equants, etc. ? Equant was introduced by Ptolemy (100-170 ad) who built a satisfactory model for the whole Solar system This model, with minor variations was used successfully until 17th century, when it was replaces by Kepler's laws, where the motion is on ellipses and the angular velocity is not constant
Equant Technologies Equant provides Solutions for Managing Operating transportation fleets, TVM On-line booking service We provide our solutions for Governmental, Private Transportation fleets, Private Compounds, Universities Schools
Kepler’s New Astronomy: Ptolemys Equant - YouTube Ptolemy caused planets to slightly change their speed throughout their orbit, by using a mathematical point called the equant This video explains how Kepler thought the equant was a
University of Nevada, Las Vegas In an epicycle model, a planet orbits on an epicycle which orbits on a deferent The eccentric Earth and the equant are special features of the epicycle models of the Ptolemaic system
Equant Explained Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets The equant is used to explain the observed speed change in different stages of the planetary orbit
What is Equants? - Graduate Ninja An equant is a geometric concept used in ancient and medieval astronomy to improve the accuracy of the epicycle and deferent system, which was used to explain the retrograde motion of celestial objects, such as planets