very bright large object turning, slowing and climbing at high speed

I was standing outside facing northwest looking at the sky when I noticed a very bright object coming into my right lone of site.  Thought it a aircraft at first, then maybe Jupiter.  I could see jupiter above and behind me so this was not Jupiter.  I then watched the object and saw itno navigation lights just big as Jupiter and much brighter.  Object was moving slowly and I checked 2 make sure it was moving.  
Object then appeared to make a sweeping left turn and then another back on prior course.  Object then began 2 climb and as it climbed I could see other aircraft beneath it in the distance.  I watched it till it disappeared.  It was so bright I could see it out a very long way and guess it was visible for at least ten minutes.  Visibility was clear with some clouds far to the north east.
Witness indicates that the date is approximate.  PD