I ran into the other room to grab a pair of binoculars and a diffraction grating. I thought maybe someone was playing with a green laser pointer, although the motion seemed a bit too smooth to be guided by a human hand. In any case, that theory was disproven when I put the diffraction grating up to the eyepiece of the binoculars: this light was emitting a band spectrum, not a single wavelength like a laser does.
As I strained to glimpse the appearance of this fast moving object in the dark, I was able to vaguely make out that the light itself was elongated vertically, and that it was part of a myserious dark shape - maybe a cylinder tilted at an angle, or possibly even triangular!
![Shocked :shock:](./images/smilies/icon_eek.gif)
A kite. Someone decided they wanted to fly a kite in the wind, and since it was night time they attached one of those chemiluminescent glow sticks in order to be able to see it. :P