I think from a game design standpoint there will be times when the game will intentionally set things up so the player will see the moon (e.g., meet someone her

I think from a game design standpoint there will be times when the game will intentionally set things up so the player will see the moon (e.g., meet someone here, cutscenes plays, player is now at a stakeout with the moon in the background), making the moon adjustable allows the artists to make their decision without needing to bother the programmer, especially if the cutscenes and camera framing aren't done yet.