Many Moons, tidally locked, are in prograde orbits about planets in prograde movement around the Sun. The result is that during Lunar aphelia, the orbital velocities of parent body and satellite are added., when closer to the Sun, subtracted, working in opposite directions. Case in Point: Europa. Orbital velocity about Jupiter: 13.74 km/sec. Vo Jupiter system about Sun 13.07 km/sec. so, it appears when aligned at perihelion, Europa should move backward on it's orbit around the Sun, and to get to that point has to come to a standstill. In a cycloid motion akin to a Rail road wheel, with a flange that moves backward from the train travel near the ground. Therefore, As seen on the far side Europa, near mid - month, the Sun must stand still and reverse in the sky for a while. Would that not create a hot spot, that would get a repeat heat treatment next time around every 84 hours? The area opposite that tropical spot, facing Jupiter all the time. would it not travel at ~22 km/sec around the Sun at aphelion? Have less chance to dwell and absorb heat the same band of solar radiation where the antipode saw the Sun loop, linger in the sky.What are the results of such thermal tides? and What effect does hanging nearly motionless with respect to the Sun at perihelion and doubling your orbital speed at aphelion have on the shape of your orbit around both the Sun? and Jupiter?