Recently I began a new play-through of my werewolf Dragonborn using a mod that allows me to become a werewolf when the moon is at a certain stage or full etc. I know that in Morrowind's expansion 'Bloodmoon' there were lunar transformation, but is there any particular reason as to why it is the moon(s) that make a person transform? to my knowledge Hircine doesn't have any relation to Masser or Secunda..
So I ask, why is it that people transform into werewolves because of the moon?