I wanted to report an interesting sighting that occurred at 13:00 hours(1:00pm) on December 14 2008 in the towns of Gainesville/Haymarket Virginia, which is outside of Washington DC.I am a Meteorologist and amateur astronomer with many years of trained observation of the day and night time sky.I've added the 11:00am-2:00pm hourly weather report for the day the sighting occurred (1:00pm) and the Astronomical data for December 14 2008. 1:52 PM, Sun 14 December 2008 47° 28° 48% 30.45in 10mi 25000ft S13mph 0mph Broken Clouds 12:52 PM, Sun 14 December 2008 46° 27° 47% 30.45in 10mi 25000ft S13mph 0mph Broken Clouds 11:52 AM, Sun 14 December 2008 45° 25° 46% 30.5in 10mi 25000ft S17mph 24mph Broken Clouds 10:52 AM, Sun 14 December 2008 42° 28° 58% 30.53in 10mi 12000ft S13mph 0mph Broken Clouds Astronomical Data for December 14, 2008: Rise: Set: Actual Time: 7:19 AM EST 4:47 PM EST Civil Twilight: 6:49 AM EST 5:17 PM EST Nautical Twilight: 6:15 AM EST 5:50 PM EST Astronomical Twilight: 5:43 AM EST 6:22 PM EST Moon: 7:08 PM EST (12/14) 9:22 AM EST (12/14) Length Of Visible Light: 10h 27m Length of Day: 9h 28m Waning Gibbous, 94% Moon Illumination Sighting Report: I set out to walk my dog just as the 1:00 football games were beginning. As I walked into my backyard I was looking at the long contrails extending north to south across the deep blue sky.I soon noticed a lower flying aircraft flying from the northeast to the southwest. As I watched the aircraft I soon noticed a small white object following close behind it. Stunned at first, I starred at the object trying to figure out what this object could be. After a few seconds of observation I noticed the object was white in color and disk or orb like in appearance.While I watched the white disk it started swinging back and forth behind the airplane in a left to right type fashion. I wondered at first if I was seeing a big white bird, I quickly realized this was definitely not the case. As I watched the object swing left to right it all a sudden dove or dropped straight down and flew underneath the airplane for a few seconds, it then swung just under the plane to the left side and amazingly completely circled the airplane and then again trailed behind it.I was absolutely amazed at what I was seeing, it was at this point I thought to myself, do I have time to run inside and grab my camera. I hesitated at first thinking the object would be gone by the time I got back. Than I thought, I have to try because know one will believe me if I don't get a picture-so off I went running. I grabbed the camera, ran back outside and was just able to take a short video as the object disappeared over Haymarket toward the Bull Run mountains.I have tried to consider other explanations for this object but have been mostly unable to do so. The only possibility could be a in flight refuel for the air combats that are deployed to protect Washington DC airspace. I don't think this is much of a possibility since the aircraft the object was following was not military but a passenger plane. The white disk I saw was also not a conventional military aircraft. There wasn't any wings visible on the craft and the craft was more disk/orb like in appearance.I wanted to report this sighting to you in hopes that someone else in my area may have also seen this remarkable ariel display.I Thank You.