Sorry, I was slightly angry at everyone else, I guess I took it out on you, didn't I? Oops. Okay, here we go:

I am the 53rd, yet the 6th.
I am both as fickle and as helpful as the water.
I live near to you, yet can be so far away.
Who am I?

I'll try to check at approx. Hourly intervals throughout the evening/night.