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    LoyalLoyalJusticeJustice
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    Home/Original/inverse
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    Inverse View

    It is not the case that Planetary motion is irregular rather than uniform on an eccentric circle, contrary to the Copernican assumption.

    ?Set your confidence on the premises below to see your aggregate.

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.The motive power of the Sun diminishes with distance from the Sun.
      ?

      Think about whether this reason is strong or weak

    • 2.Planets are at varying distances from the Sun at different points in their orbits.
      ?

      Think about whether this reason is strong or weak

    • 3.Therefore, planetary velocity changes continuously as distance from the Sun changes.
      ?

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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.Kepler's area law demonstrates empirically that a planet sweeps equal areas in equal times, directly entailing non-uniform angular velocity.
      ?

      Think about whether this reason is strong or weak

    • 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.
      ?

      Think about whether this reason is strong or weak

    Reason against 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.
      ?

      Think about whether this reason is strong or weak

    • 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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