What is the reason for your nickname ?

Well, my first post here so might as well post the meaning of my name.

My name is fairly obvious to those who have read the Silmarillion. Tilion is the one who guides the moon in its journey through the heavens. However, he sometimes draws off course because he is so drawn to the sun and its guide - sometimes the shadow of the moon will even block out the sun because he draws too near.

I liked the sound of the name and the character behind it - he carries a wondrous bow of silver and fought off the dark hosts of Morgoth when he assailed the moon and its light when it appeared.