Re-examining Venus's Retrograde Rotation: The Role of Earth-Venus Gravitational and Magnetic Coupling

Abstract

Geruganti Sudhakar

This paper presents an alternative hypothesis for Venus’s retrograde rotation, challenging the conventional solar tidal model. I propose that gravitational resonance and magnetic field interactions between Earth and Venus—facilitated by their dimensional similarity—are the primary drivers of Venus’s spin reversal. Through analytical modeling of orbital dynamics and magnetospheric interactions, I demonstrate that:

• Earth-Venus gravitational resonance creates torque perturbations sufficient to alter Venus’s spin axis over billion- year timescales.

• Asymmetric magnetic coupling in the Sun-Earth-Venus-Moon system generates inductive currents in Venus’s ionosphere that contribute to angular momentum transfer.

• Dimensional congruity between Earth and Venus (0.81 M⊕, 0.95 R⊕) enables these interactions, which would be impossible for dissimilar planetary pairs.

These mechanisms collectively explain Venus’s retrograde rotation without relying solely on solar atmospheric tides.

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