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TT-UT1 2000+ ΔT vs. time from 1657 to 2022 [1] [2] In precise timekeeping, ΔT (Delta T, delta-T, deltaT, or DT) is a measure of the cumulative effect of the departure of the Earth's rotation period from the fixed-length day of International Atomic Time (86,400 seconds).
The Scottish physicist James Clerk Maxwell proposed measuring time with the vibrations of light waves in his 1873 Treatise on Electricity and Magnetism: 'A more universal unit of time might be found by taking the periodic time of vibration of the particular kind of light whose wave length is the unit of length.' [5] [6] Maxwell argued this ...
The most famous example of a timekeeping device during the medieval period was a clock designed and built by the clockmaker Henry de Vick in c.1360, [88] [101] which was said to have varied by up to two hours a day. For the next 300 years, all the improvements in timekeeping were essentially developments based on the principles of de Vick's ...
This is a list of some experimental laboratory atomic clocks worldwide. This list is incomplete; you can help by adding missing items. ... DOST-PAGASA Juan Time [27]
International Atomic Time (abbreviated TAI, from its French name temps atomique international [1]) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. [2] TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. [3]
A nuclear clock or nuclear optical clock is an atomic clock being developed that will use the energy of a nuclear isomeric transition as its reference frequency, [1] instead of the atomic electron transition energy used by conventional atomic clocks.
A leak from Fandom's Community Council was posted to Reddit's /r/Wikia subreddit in August 2018, confirming that Fandom would be migrating all wikis from the wikia.com domain, to fandom.com in early 2019, as part of a push for greater adoption of Fandom's wiki-specific applications on both iOS and Android's app ecosystems. The post was later ...
Cutler worked at Hewlett-Packard Laboratories (1957–1999), where he developed oscillators, atomic frequency standards and designed atomic chronometers. In 1999, he went on to work at Agilent Technologies, a spin-off from H-P, where he developed quartz oscillators, atomic clocks, and used the Global Positioning System to synchronize clocks worldwide. [3]