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    Planetary motion is irregular rather than uniform on an e... — Carmelics
    Home/Modality & Possibility
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    Planetary motion is irregular rather than uniform on an eccentric circle, contrary to the Copernican assumption.

    Causation
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    2 reasons for
    1 reason against

    Reasons For

    2 perspectives
    Reason for 1 of 2
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    • 1.Kepler's area law demonstrates empirically that a planet sweeps equal areas in equal times, directly entailing non-uniform angular velocity.
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    • 2.Aristotelian physics itself distinguishes between uniform circular motion as an ideal and actual sublunary irregularity, making irregular celestial motion conceptually coherent.
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    • 3.The observed longitudinal discrepancies in Tycho Brahe's Mars data exceed 8 arc-minutes, a magnitude too large to attribute to observational error and irreconcilable with uniform circular motion.
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    Reason for 2 of 2
    ?
    • 1.Causal explanations in physics must posit mechanisms proportional to their effects; a physically real solar motive force varying with distance causally necessitates velocity variation, not mere correlation.
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    • 2.Ockham's razor favors a single elliptical orbit with variable speed over the compound epicyclic devices Copernicus required precisely to preserve uniform circular motion while matching observations.
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    Reasons Against

    1 perspective
    Reason against
    ?
    • 1.The motive power of the Sun diminishes with distance from the Sun.
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    • 2.Planets are at varying distances from the Sun at different points in their orbits.
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    • 3.Therefore, planetary velocity changes continuously as distance from the Sun changes.
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    Modality & PossibilityCausation

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    Related

    Aristotelian physics itself distinguishes between uniform circular motion as an ...Causal explanations in physics must posit mechanisms proportional to their effec...Kepler's area law demonstrates empirically that a planet sweeps equal areas in e...Ockham's razor favors a single elliptical orbit with variable speed over the com...
    +4 moreShow less
    Planets are at varying distances from the Sun at different points in their orbit...The motive power of the Sun diminishes with distance from the Sun.The observed longitudinal discrepancies in Tycho Brahe's Mars data exceed 8 arc-...Therefore, planetary velocity changes continuously as distance from the Sun chan...

    Similar

    The centripetal force for uniform motion in a circle varies as v²/r75%Modern theory dictates that uniform motion and rest are the same state...75%Elliptical orbits are inconsistent with motion directed by spiritual o...74%Descartes' hypothesis of motion sanctions a species of relative motion...73%

    Source

    AI-extracted1/3 agreementValid
    SEP: kepler
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    In the third part of AN, chapters 22–40, Kepler deals with the path of the Earth and intends to offer a physical account of the Copernican theory. By so doing he includes the idea that a certain notion of power should be made responsible for the regulation of the differences in velocities of the planets, which in turn have to be established in relation to the planets’ distances. Now, the Copernican planetary theory departs from the general principle that the Earth moves regularly on an eccentric
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

    Type
    claim
    Perspectives
    3 (2 for, 1 against)
    Edits
    1 edit