While driving south in meriden at 8:36, a bright white circular light was visible in the sky to the south. it was visible for about 15 seconds, it appeared to be roughly 500ft in the air and around a mile away. it did not appear to be moving while visible. over the span of about 3 seconds, as we watched the light gradually dimmed until no longer visible, no craft behind the light was visible either before or after the light faded. there were also no other lights visible, no blinking lights typical of planes or helicopters or any other kinds of lights.