round orb, zig zagging across sky, dimmed and changed lights

Driving home we saw neighbors looking up pointing at something.  We stopped the car, got out, saw a bright orb in the sky.  The orb moved very slowly at first.  Then began to zig zag across the sky.  At one point it changed its bright lights to peripheral lights as if it were making a landing and powering down.  Then it disappeared behind the tree line.  The general direction the object was seen was over the general vicinity of Stone Mountain.