02/22/2016 – Ephemeris – Actual gravitational waves detected!
Ephemeris for Monday, February 22nd. The Sun will rise at 7:32. It’ll be up for 10 hours and 47 minutes, setting at 6:20. The Moon, at full today, will rise at 6:32 this evening.
On February 11th the LIGO team announced the discovery of gravitational waves coming from two black holes merging over a billion light years away. LIGO stands for Laser Interferometry Gravitational-wave Observatory. Two interferometers, one in the state of Washington, and the other in Louisiana detected the same signal milliseconds apart. An interferometer sends a split light beam onto two paths 90 degrees apart to strike mirrors and return to interfere with itself. A minute change in the length either light path will show up as a change in the interference. The maximum change was one-one thousandths of the diameter of the proton subatomic particle. This is a greater discovery than the Higgs Boson of a few years ago.
Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.