Two people view bright circular object zig zagging in sky over park

We were laying in a field at a public park in our neighborhood.  We were stargazing when we saw a bright objet that appeared to be a star start moving.  We live near an airport so we know what planes both look and sound like when they fly overhead.  This object did not flash, make any noise, and was definitely not the shape of an airplane. The other thing it did that airplanes cannot do is zig zag.  It began moving straight at an insanely high speed and then began making Z shapes in its movement.  Again, this object was one bright light source, zig zagged, and did not make a sound.  It then flew off and the light became faint and disappeared as though it were going through a cloud - despite no clouds being in the sky. It blended in perfectly with a star, we thought it was a star at first!  But this thing was not a star.