strange light from sky came down in field then back up again.

my father and i was hunting with his dog in a corn feild on the edge of a timber line. i was watching a light in the sky, it was a different color whit and brighter than the other stars. as we was walking it made a move in a cork screw motion down toward the ground. i thought it was a air plane,then it stoped just of the ground with no noise of any kind. it was the size of a house and about 200 ft. from where we where standing. i still was waiting to hear a engine noise from a helocopter because it just stoped with out touching the ground. it stayed what seemed like 3 or 4 min. then went back up as fast as it came down . with the same cork screw motion and back to the same highth in the sky.it looked like any other star but the light was not the same. the light was so brite that it was brighter than the day lite and you could not make out any shape. till this day i still watch the night ski and can pick it out, it is best in the winter months. i have shown this to other people and they can belive what they see. if you steady your self aganist some thing you can see that it moves around in a small area with a bounce motion and from side to side. it has been a problem i wish i had an answer to, may be i could sleep better.
Date is approximate.  PD