Large triangle of lights near Enola, PAI saw an extremely large unknown aircraft at around 4:30 AM on the morning of January 23, 2009. I was outside on my sidewalk having a cigarette, when I happened to notice a very bright light flying to the east. I assumed this was just a plane landing at Harrisburg International Airport (KMDT), as my house is more or less on the approach to runway 13 there. I paid little attention to it until it drew a little closer, when I realized that it was not one landing light, but about nine of them arranged in a huge triad formation. Above these lights were a pair of ICAO standard recognition/nav lights, moving with the landing lights. Actual assessment of the size of this object was difficult, as it was dark, and the low amount of noise it made would indicate it was quite high. The faint and indistinct noise signature makes it seem all the bigger, as visually it seemed gigantic. It continued flying an easterly course a ways south of my house, until it disappeared from view. It did not seem to be moving particularly fast, certainately no faster than a commercial airliner. It made no sudden or erratic movements, and it's behavior seemed consistent with known laws of aerodynamics. This, combined with the fact that it had operating recognition lights, makes me certain it was terrestrial in origin, yet the sheer size of it makes it hard for me to explain. I also have some background information about me that is relevant. I am a rather large aviation buff, and I am taking flight lessons at the Lancaster, PA airport (KLNS). I have a total of sixteen hours logged, all in an Evektor Sportstar light-sport aircraft. I have a fairly good knowledge of Aviation-related subjects, and can recognize nearly any western commercial or military aircraft.