At app. 9pm i was looking for my wife (who was gardening). i stepped onto the back deck and looked into the sky above my street. i observed a circular craft app. 50 to 100 ft across at an altitude of app. 80 to 100 ft above the roadway. i was frozen, just staring at the object that moved very slowly and silently in a straight line above the road. there was no lights or features that i could see. i ran into the house yelling for my wife but got no answer. i opened the front door and i could see the craft moving slowly in a straight line. there was a woman pushing a stroller right under the craft and vehicles driving by. i did not think to shout to them. my phone at the time was a blackberry and i did not get any pictures. i didn't know who to call. this was one of two craft that i seen up close. i have also seen two other objects (lights) at a distance.