April 21, 2017, 8:00 pm, i was on patio looking south when i observed a bright green rectangle object moving slowly south. it then stopped momentary, changed direction, then continued south for about 10 seconds when the bright green lights instantly changed to bright red and at the same time began a descent in the same southerly direction until it disappeared below distant tree line. at no time while i observed this object were there any noise or blinking lights, this object was no airplane or helicopter. i mentioned earlier that it stopped momentary and changed direction, it appeared to stop, back up then continue for- ward in the blink of the eye.P