@rizzzoooooo I feel like I’m coming in late on the train here but I agree that “New Dusk” is just the way October is expressed.
I’ll stretch a little further and lay a soft OOA calendar is actually astromonical themed theory down: April is called New Dawn. Perhaps other months will be named Dawn/Dusk Twilight, or waxing/waning Dawn, etc.
Just a theory though and probably doesn’t have a ton of significance.