Clear night, stars rarely as visible as then. Two lights of bright yellow colour appeared moving almost symmetrically to each other in a spiral motion, it appeared they almost collided with each other a few times, but didn't. Unsure about vertical distance but was at least 0.5 and at most 1.5 kilometers. The objects/lights appeared as big as a lozenge from the ground and remained very close to each other. They left a very slightly visible (mostly bright yellow, with a bit of orange in it) glow as their motion blurred the 'afterlight' of their path. Without changing speed, they canceled the spiral motion, synchronized their path and speed (which differed about 15% before), and after making a suddenly huge semi-concentric circle (basically turning back 180 degrees, but this sudden turn spanned for a few kilometers), they continued leaving in a straight line, remaining synchronized and slightly increasing their speed as they moved further. Obviously, their size shrunk with distance until they were completely gone. The sighting lasted for about 7-10 seconds. Spotted by a 'realist skeptic', ruled out any known flying objects.