You specified in reference to the sun. A day on earth is one rotation or revolution about its own axis. Has nothing to do with the sun. A rotation in reference to the sun is one year.

What did they do to deserve a whole year?

I would love to sell my trilogy, Dante’s Darkness, starting with Winds as a six episode mini series. Yes, the writing is rough, but the story is fun and power creep but not overwhelming. Unfortunately, I wrote about the end of the world right before shit went really South. Remember your UV anal cleansings, folks!