I was sitting in my back yard star gazing and then the sky became overcast—shortly thereafter, i saw these blue-light objects with blue trails swoop overhead and begin to zig-zag back and forth—that's when i realized they were not normal aeronautical devices that i am familiar with—–then, suddenly, they all lined up and retreated in a converging fashion as if to arrive at the same spot at the same time—-and they did—-when they arrived at that spot, they all turned into a large yellow ball—and vanished. then i went into the house and told my wife—-then proceeded to the computer to try to find a way to report it—–although i didn't find a way, on the computer ( until now), i did write my experience down to save the details.