Because the Phoenix’s power is great, but not infinite. It begins the year in the full flower of its might, but as it expends its flame to heat & light the world below, it gradually grows weaker, till by mid-winter, its flame is all but extinguished. I’d explain how said flame is lit again, but that’s a plot point.
And there are no months.
No, yes, answered above, and it doesn’t–that is, the “moon” in the Fabulous Plane has no phases. It’s not used to mark time.
It’s east-to-west each time. No character in the story has any idea what the Phoenix does when it dips out of sight each evening. As the FP’s creator, I’ve gone back and forth between two thoughts:
There’s another world on the “underside” of the Fabulous Plane which the Phoenix also acts as the sun for, and
When it crosses the western horizon, the Phoenix passes through a sort of space-time warp. That is, the space in this world is “closed,” so that it passing through the horizon on the west takes you back to the west; but from the point of view of a person undergoing such a journey, the transition is instananeous, whereas from the point of a Fabulous creature there is a twelve-hour (or so) gap between the two (otherwise night as night).
I’d already thought of the Swift & the Slow names, but, as I mention in another post in this thread, I see the days as getting LONGER in the winter, not shorter, as the Phoenix grows wearier. I hadn’t thought of the shadow idea yet; that’s a good one. I do want to explore ways the Fabulous Plane fucks with the minds of human visitors.
Tolkien didn’t invent the word “Winterfilth”, fwiw. Also it doesn’t have anything to do with muddy weather but with the “filling” of the first full moon of the season. Just today’s piece of trivia.
Oh, I know that–both data, actually. I’m using “Winterfilth” as a place-holder till I think of something without the connotation (to modern ears) of mud & dirt; also because, since there are no moon-phases in this world, the “filling” part doesn’t work.
You know, you could also use the names of Months & Days from the Revolutionary Calendar to provide names for counties/shires/villages/town in your world.