The Mayan apocalypse believed by some to be taking place on Dec. 21, 2012, has apparently been preceded by multiple sightings of UFOs hovering over major U.S. cities. In the past week, San Francisco and Brooklyn were both treated to the sight of mysterious illuminated objects floating in the sky.

On Dec. 3, in the Prospect Heights neighborhood of Brooklyn, an amateur video captured a slow-moving parade of lights overhead. The trio of lights appeared to move in a coordinated fashion, slowing down and then moving again in roughly the same direction and at the same speed.

A similarly choreographed ballet of lights, reported by some as a UFO sighting, danced over the Mission district of San Francisco in the wee hours of Dec. 9. As in the Brooklyn sighting, the lights seemed to hover calmly above the city, then slowly drift away in unison, as seen in this amateur video .ufosoverSanFRan

At least one astronomer was stumped by the San Francisco sighting. “Its not a planet, its not a constellation, its not meteors, it’s not the moon,” Bing Quock, assistant director of the Morrison Planetarium at the California Academy of Sciences, told CBS San Francisco. “It looks to me like it could have been balloons, carrying lights.” [Infographic: Where to Spot UFOs]

more at  UFOs spotted over San Francisco, Brooklyn | Fox News.