Let's say for a moment that the spin of a planet causes the Sun's rays to be blue-shifted in the morning.
As far as I know, redshift occurs in steps of like 2.6 km/s or something like that. We can't detect redshift except in steps of at least this size for some unknown reason. And so unless the earth is spinning that fast, we wont even incur a single step. But still something could be happening.
Lets say this very subtle, microscopic variation somehow has a significant impact on a planet over the course of millions or billions of years.
My question then is: when and where on on Planet Mars would be the highest blueshift in the Sun's rays? Clearly to me its going to be in the morning. In the morning at the equator is going to be at least one of the places.
But at what time of year?
And does this time follow a line north and south around the planet?
Or is there a specific moment and place where it is highest for some reason? Like the morning of the spring equinox at the 30 degree north latitude or something? If we know blueshift will be highest on the morning of the spring equinox... then at what latitude?