A simple timelapse shows the daily day/night cycle within a larger polar day/night cycle - the only possible valid effect of two distinct rotations operating individually and in combination -

https://www.youtube.com/watch?v=pnuLTeHB3yU

One rotation is constant via an assumption that the average 24 hour day substitutes for 'constant' rotation thereby leaving the orbital surface rotation, responsible for the Polar day/night cycle, to reflect a response of variable orbital speeds of the Earth.

It is painful watching the death throes of the meaningless 'solar vs sidereal' fiction but ultimately the planet's two actual day/night cycles will emerge from behind the pseudo-intellectual noise. The principles of timekeeping for Earth can be applied to Mars with its own equable hours, minutes and seconds, its own calendar framework, its own Lat/Long system and 24 hour AM/PM cycle and even the predictive utility of a RA/Dec framework.