Today at 10:30 pm myself Roberta, Renata and Carlos upon leaving Manaca Restaraunt and walking to the parking lot witnessed a ufo in the sky travel from about 40 degrees NE to approximately 220 degrees SW. The objet approached in a straight line then quickly zig zagged NW to SE then continued on a path traveling SW. After the object passed overhead it zig zagged again NW to SE then suddenly disappeared in an upward direction. The objet had a bright whitish green glow in the shape of a perfect circle. The distance looked to be about the same as a jet plane would travel approximately 30,000 feet. However for the distance it covered in such a short time would be impossible for a plane to travel not to mention the quickness it zig zagged. This was definitely an object not anyone of us had seen before. There was a cloud cover and not one star was visible.