How does levitation occur while meditating?

How does levitation occur while meditating? Levitation happens to many meditators.. We have three bodies - physical body, mental body and astral body.. Astral body is connected to physical body by very thin silver wire at navel..astral body can go out of physical body.. When meditator levitates it is the astral body that levitates but astral body remains in proximity..never to go more than few inches or feet away from physical body. Physical body never levitates..but levitation of astral body feels as real as levitation of physical body..