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    Perspectives
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    42
    Planets move around the Sun more slowly than the Sun itse... — Carmelics
    Home/Modality & Possibility
    HistoryEditSee Inverse

    Planets move around the Sun more slowly than the Sun itself rotates.

    CausationModality & Possibility
    ?Rate how convincing each reason is below to see the overall strength.
    1 reason for
    2 reasons against

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.Matter possesses an inherent tendency to rest (inclinatio ad quietem).
      ?

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    • 2.This tendency to rest resists the motive power emanating from the Sun.
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    • 3.Therefore, the actual orbital velocity of a planet is less than what the Sun's motive power alone would produce.
      ?

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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.The Sun's rotational period (~25 days) is faster than Mercury's orbital period (~88 days), but slower than no known planetary orbital period when measured in the same units.
      ?

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    • 2.Kepler's own *Astronomia Nova* data shows all planets take longer to complete one orbit than the Sun takes to complete one rotation, making the claim trivially true but explanatorily vacuous without specifying the causal mechanism.
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    • 3.A claim that merely redescribes observed regularities without identifying necessary connections between rotation and orbital velocity cannot serve as a genuine causal explanation, as Hume's critique of causal inference demands.
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    Reason against 2 of 2
    ?
    • 1.Aristotelian physics, which Kepler partially retained, attributes natural circular motion to celestial bodies as their proper form, requiring no external motive power to sustain it.
      ?

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    • 2.If planets possess their own intrinsic principle of circular motion, as Aristotle argued in *De Caelo*, then the Sun's rotation is causally irrelevant to planetary velocity, undermining the supporting argument's causal chain.
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    • 3.The inference from correlation between solar rotation rate and planetary speeds to a motive emanation is a post hoc fallacy without an independently established transmission mechanism.
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    Modality & PossibilityCausation

    Related

    A claim that merely redescribes observed regularities without identifying necess...Aristotelian physics, which Kepler partially retained, attributes natural circul...If planets possess their own intrinsic principle of circular motion, as Aristotl...Kepler's own *Astronomia Nova* data shows all planets take longer to complete on...
    +5 moreShow less
    Matter possesses an inherent tendency to rest (inclinatio ad quietem).The Sun's rotational period (~25 days) is faster than Mercury's orbital period (...The inference from correlation between solar rotation rate and planetary speeds ...Therefore, the actual orbital velocity of a planet is less than what the Sun's m...This tendency to rest resists the motive power emanating from the Sun.

    Similar

    The Sun rotates in a single direction.79%All planets move in the same direction as the Sun rotates.77%Yet some spheres move slowly (such as the sphere of fixed stars) and o...74%The rotation of the Sun is the cause of the planets' orbital motion ar...73%

    Source

    AI-extracted1/3 agreementValid
    SEP: kepler
    View source passageHide passage
    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 (1 for, 2 against)
    Edits
    1 edit