But LIGO did not register the gravitational waves coming from them until 9:50:45 Coordinated Universal Time on 14 September, when the wave's frequency rose above some 30 cycles per second (hertz)-- corresponding to 15 full black - hole orbits per second — and was finally high enough for the detectors to distinguish it from background noise. (nature.com)
Winter Solstice This site includes a graph showing how the date of the Winter Solstice changes from year to year, a table of universal times of the Winter Solstice, a QuickTime movie illustrating the tilt of Earth relative to the sun, and other miscellaneous data about the Winter Solstice. (educationworld.com)
Time is given in Universal time; central duration time (lower right) tracks how long the sun will appear blacked out to an observer on the ground. (sciencenews.org)