# Would a planet with a retrograde spin function as if it were spinning faster or slower?

I am thinking in terms of the Coriolis Effect, atmospheric circulation and specifically Hadley Cell latitudinal width here, but the base question still stands.

For ease of reference, if we take a satellite of a gas giant, assuming somehow it overcame the tidal lock, perhaps by a collision that knocked it around a bit, and started spinning in a retrograde rotation in orbit around the giant, would the absolute speed that it rotates increase or decrease relative to a base tidally locked spin when it comes to determining how physics like the Coriolis effect work?

If it was spinning faster then the Coriolis Effect would make more extreme longitudinal winds and banding, but if it spun slower then the Hadley cell would feasibly stretch all the way to the poles.

I don't know enough about physics to know which would be correct, unless it depends on how the planet developed a retrograde spin in the first place?

• When people were convinced that the Earth stood still and the sun revolved around it the Coriolis force continued to act without concerns about it. What makes you think that the perception of rotation influences physics? How do you perceive the rotation?
– L.Dutch
Commented May 25, 2023 at 3:36
• @L.Dutch I believe I misphrased my question, I will edit it - but essentially I am wondering if the total rotation, combined with the orbital period, would be added or subtracted together when factoring in retrograde orbits when it comes to things like the Coriolis effect Commented May 25, 2023 at 3:54
• The absolute speed at which it spins is the same no matter how it orbits. Why would it be different? Commented May 25, 2023 at 5:10
• I don't know enough about it, but look into the different ways to measure a day. Are we talking a sidereal day, a solar day, or what. Looking this up should help you find an answer. Commented May 25, 2023 at 6:00
• There seems to be some confusion here... to state the obvious, a planet spins at the rate it is spinning, and effects caused by that spinning will have a magnitude proportional to its spin. The direction of its spin isn't relevant. Commented May 25, 2023 at 8:24