Myself and a friend are missing time after seeing a UFO

Myself and a friend were hitch hiking and were dropped off in a rural area in Mississippi.  We saw a light and it moved slowly toward us and then zig zag ed so fast we could hardly believe it.  It made on noise as it moved over us and went behind a tree line.  It was two thirds the size of a full moon.  I ran through the trees to look at it but it had disappeared. 
On returning to my friend he was very frightened and excited, jumping up and down saying what was it. Then the sun was up and the sun was up! I have no memory of nine hours and my friend gets frightened even to this day should I mention it and will not talk about it.  I know aircraft and this was nothing man made, it moved much too slow and too fast.  The event did not scare me and I would like to know where the nine hours went,  I think. I have thought about regression hypnosis but do not trust it.  Perhaps I would be afraid if I could remember. 
I do not talk much about this as everyone thinks it's crazy but I have seen them on more than one occasion and with other people, one being a pilot who will not talk !!!
Witness indicates that date of incident is approximate.  PD