atomic clocks

Atomic Clocks So Accurate That They’re Being Used To Measure… Elevation

angular resolution, black hole, black holes, Event Horizon Telescope, interstellar dust, M87 galaxy, Milky Way galaxy, radio waves, Sagittarius A*, very-long baseline interferometry, Virgo constellation,

First Light From the M87 Black Hole: What Are We Looking At?

angular resolution, black hole, black holes, Event Horizon Telescope, interstellar dust, M87 galaxy, Milky Way galaxy, radio waves, Sagittarius A*, very-long baseline interferometry, Virgo constellation,

A 200-Year-Old Experiment Has Helped Us See a Black Hole’s Shadow

The IRNSS 1H satellite integrated with the PSLV C39's fourth stage. The payload fairing is yet to be installed (in this photograph). Credit: ISRO

‘India’s GPS’ Remains Unfinished as an ISRO PSLV Mission Fails After 20 Years

Two halves of the PSLV-C22 heat shield enclosing the IRNSS-1A satellite, whose clocks have developed glitches, ahead of launch in July 2013. Source: ISRO

Three Atomic Clocks Have Failed Onboard India’s ‘Regional GPS’ Constellation

The National Physical Laboratory, New Delhi, where the atomic maintaining Indian Standard Time are kept. Source: NPL

Listen: India’s Timekeepers and the Illogic of Standard Time