I was watching tv--my cousin who is staying with me is a smoker and was in my back yard having a smoke when he saw the lights and came inside and got me.At first i thought they were airplanes or helicopters , but they were absolutely silent. we have trees all around us so our field of vision was limited. my cousin said i didnt see them all because some of them had passed while he came inside to get me. they were moving slowly from west to east in the northern sky. their speed was constant and 7 of them were in a v formation. the others were trailing the formation and moving at different flight levels. As far as my feelings are concerned, i felt as if i had just witnessed something very strange. We lost sight of the objects when they flew out of sight because of the trees around us.