New Atomic Clock Is So Precise It Won't Lose a Second for 140M Years
(zmescience.com)
On a campus in Boulder, Colorado, time just became a little more exact.
On a campus in Boulder, Colorado, time just became a little more exact.
New atomic fountain clock joins group that keeps the world on time
(nist.gov)
Clocks on Earth are ticking a bit more regularly thanks to NIST-F4, a new atomic clock at the National Institute of Standards and Technology (NIST) campus in Boulder, Colorado.
Clocks on Earth are ticking a bit more regularly thanks to NIST-F4, a new atomic clock at the National Institute of Standards and Technology (NIST) campus in Boulder, Colorado.
ACES on its way to orbit: Ultra-precise European atomic clocks now in space
(esa.int)
ESA’s Atomic Clock Ensemble in Space (ACES) is on its way to the International Space Station to redefine how we measure time – from space. Using its two cutting-edge clocks and an advanced time transfer system, ACES will deliver the most accurate time signal ever transmitted from space and connect the world’s best clocks to test fundamental physics from orbit, including Einstein’s theory of general relativity.
ESA’s Atomic Clock Ensemble in Space (ACES) is on its way to the International Space Station to redefine how we measure time – from space. Using its two cutting-edge clocks and an advanced time transfer system, ACES will deliver the most accurate time signal ever transmitted from space and connect the world’s best clocks to test fundamental physics from orbit, including Einstein’s theory of general relativity.
DIY PTP Grandmaster Clock with a Raspberry Pi
(jeffgeerling.com)
tl;dr: I set up an open source Time Pi project to build a stratum 1 PTP and NTP timeserver using a Raspberry Pi.
tl;dr: I set up an open source Time Pi project to build a stratum 1 PTP and NTP timeserver using a Raspberry Pi.
NIST Atomic Timekeeping: Plans to Cut Team Responsible
(wired.com)
The US National Institute of Standards and Technology (NIST) is discussing plans to eliminate an entire team responsible for publishing and maintaining critical atomic measurement data in the coming weeks, as the Trump administration continues its efforts to reduce the US federal workforce, according to a March 18 email sent to dozens of outside scientists.
The US National Institute of Standards and Technology (NIST) is discussing plans to eliminate an entire team responsible for publishing and maintaining critical atomic measurement data in the coming weeks, as the Trump administration continues its efforts to reduce the US federal workforce, according to a March 18 email sent to dozens of outside scientists.
Launching the First Optical Grating Clock Successfully Miniaturized
(shimadzu.co.jp)
島津製作所は、3月5日に18桁精度※1に相当するストロンチウム光格子時計※2「Aether clock OC 020」（イーサクロック、以下、本製品）の受注を開始します。光格子時計は原子時計の一種で、現在の「秒」の定義の基準となっているセシウム原子時計に対して100倍以上の精度を実現します。18桁精度は100億年に1秒の誤差に相当し、光格子時計は次世代の「秒」の定義の有力な候補として注目されています。本製品は2024年11月に、装置体積250ℓの小型化に成功した装置で、光格子時計としては世界初の商用機となります。各国の標準機関や大学・研究所などに設置することで、時間基準としてだけではなく様々なフィールド・目的で使用できます。
島津製作所は、3月5日に18桁精度※1に相当するストロンチウム光格子時計※2「Aether clock OC 020」（イーサクロック、以下、本製品）の受注を開始します。光格子時計は原子時計の一種で、現在の「秒」の定義の基準となっているセシウム原子時計に対して100倍以上の精度を実現します。18桁精度は100億年に1秒の誤差に相当し、光格子時計は次世代の「秒」の定義の有力な候補として注目されています。本製品は2024年11月に、装置体積250ℓの小型化に成功した装置で、光格子時計としては世界初の商用機となります。各国の標準機関や大学・研究所などに設置することで、時間基準としてだけではなく様々なフィールド・目的で使用できます。
The Internet's Time Is Flawed–Why No One Is Talking About It
(ycombinator.com)
I’ve been researching how online time services sync over HTTPS, and the results are surprising.
I’ve been researching how online time services sync over HTTPS, and the results are surprising.
Chimes at Midnight (2024)
(asteriskmag.com)
It’s been an idea for over three decades. How did the clock that will run for 10,000 years become a reality?
It’s been an idea for over three decades. How did the clock that will run for 10,000 years become a reality?
Lunase moon phase watch mechanism
(genuineideas.com)
Before there were clocks there were the heavens. The sun to mark the day and the moon to light the night- their shadows counting down the hours. Overhead, celestial bodies arced across the sky, charting a map to the seasons and subtly precessing across the centuries.
Before there were clocks there were the heavens. The sun to mark the day and the moon to light the night- their shadows counting down the hours. Overhead, celestial bodies arced across the sky, charting a map to the seasons and subtly precessing across the centuries.
Elektročas HH3 – the most accurate pendulum clock on the planet
(cern.ch)
Can a pendulum clock be good to one second in 158 million years? A piece of cake...
Can a pendulum clock be good to one second in 158 million years? A piece of cake...
Elektročas HH3: the most accurate pendulum clock on the planet
(cern.ch)
Can a pendulum clock be good to one second in 158 million years? A piece of cake...
Can a pendulum clock be good to one second in 158 million years? A piece of cake...
Unix Time and a Modest Proposal
(johndcook.com)
It seems our choices are to add leap seconds and endure the resulting confusion, or not add leap seconds and allow the year to drift with respect to the day. There is a third way that deserves more consideration: adjust the position of the earth periodically to keep the solar year equal to an average Gregorian calendar day.
It seems our choices are to add leap seconds and endure the resulting confusion, or not add leap seconds and allow the year to drift with respect to the day. There is a third way that deserves more consideration: adjust the position of the earth periodically to keep the solar year equal to an average Gregorian calendar day.
Meet your new Time Server
(centerclick.com)
CenterClick produces the NTP200 series GPS based NTP Server Appliances that keep your equipment synchronized.
CenterClick produces the NTP200 series GPS based NTP Server Appliances that keep your equipment synchronized.
Major leap for nuclear clock paves way for ultraprecise timekeeping
(nist.gov)
A powerful laser shines into a jet of gas, creating a bright plasma and generating ultraviolet light. The light leaves a visible white line as it interacts with leftover gas in the vacuum chamber. This process helps scientists precisely measure the energy needed to excite the thorium-229 nucleus, which is the core of a future nuclear clock.
A powerful laser shines into a jet of gas, creating a bright plasma and generating ultraviolet light. The light leaves a visible white line as it interacts with leftover gas in the vacuum chamber. This process helps scientists precisely measure the energy needed to excite the thorium-229 nucleus, which is the core of a future nuclear clock.
The Principles of Mr. Harrison's Time-Keeper
(incoherency.co.uk)
This post is a transcription, plus some commentary, of the Board of Longitude's 1767 document "The Principles of Mr. Harrison's Time-keeper", from scans on the University of Cambridge Digital Library.
This post is a transcription, plus some commentary, of the Board of Longitude's 1767 document "The Principles of Mr. Harrison's Time-keeper", from scans on the University of Cambridge Digital Library.
The Sundial Cannon of Åtvidaberg (2017)
(amusingplanet.com)
In the not-too-distant past, before the invention of modern timekeeping devices, noontime —the moment when the sun is at the highest position in the sky— held special significance.
In the not-too-distant past, before the invention of modern timekeeping devices, noontime —the moment when the sun is at the highest position in the sky— held special significance.