Latest Atomic clock Stories
Physicists at JILA have created the first "frequency comb" in the extreme ultraviolet band of the spectrum, high-energy light less than 100 nanometers (nm) in wavelength.
The ability to accurately measure a second in time is at the heart of many essential technologies; the most recognizable may be the Global Positioning System (GPS).
An attempt to eliminate leap seconds and permanently change how time is measured has been postponed until 2015 by the International Telecommunications Union.
Leap seconds are tiny bits of time added to calendars and clocks in hopes of reconciling the difference between atomic time used by computer systems and time as defined by measuring the Earth’s movement around the sun and its daily, but slightly slowing, rotation.
Laser frequency combs—extraordinarily precise tools for measuring frequencies (or colors) of light—have helped propel advances in timekeeping, trace gas detection and related physics research to new heights in the past decade.
- A handkerchief.
- Specifically— The legendary sweat-cloth; the handkerchief of St. Veronica, according to tradition miraculously impressed with the mask of Christ; also, the napkin about Christ's head (Johu xx. 7).
- In general, any miraculous portrait of Christ.