atomic clocks

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

Bas den Hond 20/09/2020

Atomic clocks are now so accurate that Earth’s gravity...

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?

Joseph Samuel 15/04/2019

How does a picture of a luminous ring around...

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

Vasudevan Mukunth 10/04/2019

With one fuzzy image, history has been made.

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

Vasudevan Mukunth 02/09/2017

A spare satellite, IRNSS 1I, was expected to launch...

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

Vasudevan Mukunth 30/01/2017

A replacement satellite will be launched in the second...

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

Padmaparna Ghosh and Samanth Subramanian 22/09/2015

Some of us check the time on our wrists,...