ICOT – very interesting! I was quite an amateur astonomer when I was young, but I didn’t know that.
When I saw your riddle, I immediately thought of Mercury and that you had made a mistake (but I was waiting for your answer to say so, and good thing I did!). You see, I read somewhere years ago that on Mercury it appears that the Sun reverses its course in the sky every day (i.e. Mercury day) around noon time because of the refraction of light in the intense heat. I thought that you were thinking of this and that you had just assumed it could also happen at sunrise.
Do you have any idea if that scientific “fact” that I mentioned is still considered a fact? Or is my brain hampered by being old enough to remember Mariner 10?