I also mention measuring days with regard to the start we are orbiting (Sun and solar days) compared to the distant stars (sidereal days), so no misunderstandin

I also mention measuring days with regard to the start we are orbiting (Sun and solar days) compared to the distant stars (sidereal days), so no misunderstanding here. Once again it is about having Sun at more or less its highest point in the sky at noon. With sidereal time it would constantly shift and if you had sun highest at noon today, if would be highest at midnight half year from now.