Q: The moons are severed bodies of a dead god. They are incomprehensible and infinite planes of existence that merely appear as spheres to our limited mortal perception. They don't have to make sense!
A: They also don't have to not make sense.

Q: In lore, stars are suppose to shine through the dark side of the moons!
A: But they don't even in the vanilla game. The moon textures are actually transparent in the game data, but Bethesda purposefully added opaque black circles behind the them. It is clear they wanted the moons to appear as more mundane celestial objects for Skyrim, but were too lazy to get the middle school astronomy portion working accurately.

Q: Skyrim is just fantasy, how do you know it wasn't suppose to be this way?
A: The Fallout moon isn't fantasy, and it works the same way as in Skyrim. It was obvious that this is just an oversight Bethesda never bothered changing in the engine (TBF, they did change how the moon worked in Fallout 4: it now rises in the west and sets in the east daily, and it is now a billboard that rotates with the camera, yet the phases still don't make sense).

Q: The moon and sun movements are not perfect. There is no precession, inclination, obliquity, etc, etc.
A: Yea, it is not perfect, but it is better than before.

Q: Why is the moon not in sync with the sun. Why isn't there always moon at night?
A: In real life, our moon is only above the horizon about half the time. This is true both during the day and at night. If the moon moved in sync with the sun, there wouldn't be different phases. This is middle school astronomy.

Q: Can you change the sun's ecliptic?
A: No, that breaks ENB features like sunrays.

Q: Can you make the moons overlap?
A: No, the moons will appear transparent when they overlap.

Q: Is this compatible with whatever moon-related mod?
A: It is compatible with texture replacers and size changers. Be aware that if the moons are too big, when they overlap, it may not look correct (this is not due to this mod, but an issue in vanilla as well). This mod changes the phase cycle for Secunda, and will be inconsistent with any mods that assume vanilla Secunda phase cycle.

Q: Is this compatible with whatever random unrelated mod?
A: This mod only changes how the moons and stars move and the moons' phases. These changes are purely visual in the vanilla game. This mod doesn't, by itself, change anything about "lighting", "weather", "time", "calendar" , "stealth", "sneaking", "moon sugar", "werewolves", "vampires", "survival", "ai", or any number of other unrelated things.