This sighting occurred about 12 years ago in late summer about 6pm. my wife and i were walking down the street outside our house and we both looked up to the sky which was overcast wondering if it would rain. through a break in the clouds we saw a dull green disc with a darker center fly by- the cloud cover seemed to be fairly low. the sighting lasted only a second. there was no sound, in fact the evening was very quiet. i can't say if the sighting was a craft of some sort or a meteorite with a disc shaped gaseous cloud around it but it moved with the disc shape staying intact. it is one of the only two strange aerial sightings i have seen, both in sudbury, ontario.