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Clock that monitors the resonant frequency of atoms
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on the fact that atoms have quantised energy
Atomic_clock
Topics referred to by the same term
An atomic clock is a time keeping device. Atomic Clock Ensemble in Space science project a clock updated by radio signals which is sometimes called an
Atomic_Clock_(disambiguation)
This is a list of some experimental laboratory atomic clocks worldwide. "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur
List_of_atomic_clocks
Symbol which represents the likelihood of a human-made global catastrophe
opinion of the nonprofit organization Bulletin of the Atomic Scientists. Maintained since 1947, the Clock is a proxy mechanism for threats to humanity from
Doomsday_Clock
Extremely accurate clock in development
A nuclear clock or nuclear optical clock is an atomic clock which uses photons from a nuclear isomeric transition as its reference frequency, instead
Nuclear_clock
Instrument for measuring, keeping or indicating time
quartz clocks and watches. Currently, atomic clocks are the most accurate clocks in existence. They are considerably more accurate than quartz clocks as they
Clock
Small form factor atomic clock
A chip scale atomic clock (CSAC) is a compact, low-power atomic clock fabricated using techniques of microelectromechanical systems (MEMS) and incorporating
Chip-scale_atomic_clock
Time standard based on atomic clocks
Earth's geoid. TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. It is a continuous scale
International_Atomic_Time
Clock which synchronizes its time using radio transmitters
radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly) referred to as an "atomic clock", is a type of quartz clock or watch
Radio_clock
SI unit of time
count seconds accurately were pendulum clocks invented in the 17th century. Starting in the 1950s, atomic clocks became better timekeepers than Earth's
Second
Primary time standard globally used to regulate clocks and time
atomique international), which is a weighted average of hundreds of atomic clocks worldwide. UTC is within about one second of mean solar time at 0° longitude
Coordinated_Universal_Time
Where a clock does not run at same rate as reference clock
mechanical clock. Hence most everyday quartz clocks do not have an adjustable drift correction. Atomic clocks are very precise and have nearly no clock drift
Clock_drift
Type of atomic clock
Optical clocks are a subset of atomic clocks and are based on transitions that emit electromagnetic radiation in the range of 200 nm to 1000 nm. Optical
Optical_clock
Satellite navigation system
space-qualified Indian made atomic clocks was initiated, along with a study and development initiative for an all optical atomic clock (ultra stable for IRNSS
Indian Regional Navigation Satellite System
Indian_Regional_Navigation_Satellite_System
Atomic clock used for radio navigation in space
The Deep Space Atomic Clock (DSAC) was a miniaturized, ultra-precise mercury-ion atomic clock for precise radio navigation in deep space. DSAC was designed
Deep_Space_Atomic_Clock
Clock type
settings atomic clocks had replaced quartz clocks as the basis for precision measurements of time and frequency, resulting in International Atomic Time.
Quartz_clock
Experiment
The Atomic Clock Ensemble in Space (ACES) is a project led by the European Space Agency (ESA), placing ultra-stable atomic clocks on the International
Atomic Clock Ensemble in Space
Atomic_Clock_Ensemble_in_Space
Test of relativistic time dilation
cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world, first eastward, then westward, and compared the clocks in motion
Hafele–Keating_experiment
133 Atomic Watch the first watch to keep time with an internal atomic clock. Unlike the radio watches described above, which achieve atomic clock accuracy
History_of_watches
Primary frequency standard
Gernot M. R. Winkler of the United States Naval Observatory. Caesium atomic clocks are one of the most accurate time and frequency standards, and serve
Caesium_standard
Measured time difference as explained by relativity theory
flew caesium atomic clocks east and west around the Earth in commercial airliners, to compare the elapsed time against that of a clock that remained
Time_dilation
Type of atomic clock
In atomic, molecular, and optical (AMO) physics, an optical lattice clock is a type of atomic clock that uses neutral atoms confined in an optical lattice
Optical_lattice_clock
Frequency standard
A rubidium standard or rubidium atomic clock is a frequency standard in which a specified hyperfine transition of electrons in rubidium-87 atoms is used
Rubidium_standard
Precision clock that synchronizes other clocks in a network
governed by primary reference atomic clocks in many countries. A modern, atomic version of a master clock is the large clock ensemble found at the U.S. Naval
Master_clock
Effect that limits performance of advanced atomic clocks
limitation to frequency stability for modern atomic clocks such as atomic fountains and optical lattice clocks. It is an aliasing effect: High frequency
Dick_effect
Atomic clock
NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and served
NIST-F1
Laser-cooled atoms in flight
transition can be used in an atomic clock measurement to high precision. The measurement of a hyperfine transition in an atomic fountain uses the Ramsey method
Atomic_fountain
Type of clock with laser-cooled single ions
A quantum clock is a type of atomic clock with laser cooled single ions confined together in an electromagnetic ion trap. Developed in 2010 by physicists
Quantum_logic_clock
Atomic clock used for US time standard
NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard. NIST-F2 was brought
NIST-F2
practical use today are atomic clocks, which can be accurate to a few billionths of a second per year and are used to calibrate other clocks and timekeeping instruments
History of timekeeping devices
History_of_timekeeping_devices
American drummer (born 1967)
retains high accuracy at extreme tempos, earning him the nicknames "The Atomic Clock" and "Human Drum Machine". Hoglan has played for numerous metal bands
Gene_Hoglan
Nonprofit organization and journal concerning science and global security issues
destruction that atomic war could bring about. To convey the particular peril posed by nuclear weapons, the Bulletin devised the Doomsday Clock in 1947, with
Bulletin of the Atomic Scientists
Bulletin_of_the_Atomic_Scientists
Building complex in Mecca, Saudi Arabia
atomic clock that controls the tower clock faces. The building is topped by a four-faced clock, visible from 25 kilometres (16 miles) away. The clock
The_Clock_Towers
The Primary Atomic Reference Clock in Space or PARCS was an atomic-clock mission scheduled to fly on the International Space Station (ISS) in 2008, but
Primary Atomic Reference Clock in Space
Primary_Atomic_Reference_Clock_in_Space
Continuous progression from past to future
Unveils Chip-Scale Atomic Clock". NIST. 27 August 2004. Archived from the original on 22 May 2011. Retrieved 9 June 2011. "New atomic clock can keep time for
Time
Time standard used in astronomical ephemerides
of atomic clocks in the 1950s. Close equality between the ET second with the later SI second (as defined with reference to the cesium atomic clock) has
Ephemeris_time
Japanese time signal radio station
atomic clock in Tokyo. This information is sent to the transmitter stations and is used to set a caesium atomic clock at each station. These clocks are
JJY
Chemical element with atomic number 55 (Cs)
anodes of photoelectric cells. Caesium is widely used in highly accurate atomic clocks. In 1967, the International System of Units began using a specific hyperfine
Caesium
Type of clock
time automatically using signals from atomic clock-synced time signal radio stations such as WWV, making the clock accurate and immune to time reset due
Alarm_clock
American satellite-based radio navigation service
field using accurate atomic clocks placed in orbit inside artificial satellites. Special and general relativity predicted that the clocks on GPS satellites
Global_Positioning_System
Specification for measuring time
of a caesium atomic clock. In early history, clocks were not accurate enough to track seconds. After the invention of mechanical clocks, the CGS system
Time_standard
French physicist
1953) is a French physicist specializing in quantum optics, cold atoms, atomic clocks, and ultracold quantum gases. He is an emeritus research director at
Christophe_Salomon
Canadian shortwave time signal radio station
dissemination of official Canadian government time signals, derived from atomic clocks. The National Research Council announced that the station would close
CHU_(radio_station)
European global navigation satellite system
maser atomic clocks and two secondary rubidium atomic clocks which are independent of one other. As precise and stable space-qualified atomic clocks are
Galileo (satellite navigation system)
Galileo_(satellite_navigation_system)
Measurement standards laboratory in the United States
excellence. NIST's Boulder laboratories are known for housing NIST‑F1, an atomic clock. NIST‑F1 serves as the source of the nation's official time. From its
National Institute of Standards and Technology
National_Institute_of_Standards_and_Technology
German longwave time signal radio station
wavelength) carrier signal is generated from local atomic clocks that are linked with the German master clocks at the PTB in Braunschweig. The DCF77 time signal
DCF77
the wavelength of an optical lattice where the polarizabilities of two atomic clock states have the same value, such that the AC Stark shift caused by the
Magic_wavelength
Two interrelated physics theories by Albert Einstein
was observed, from which was concluded that the frequency of a moving atomic clock is altered according to special relativity. Those classic experiments
Theory_of_relativity
Time zone used in the Philippines (UTC+08:00)
displayed on television and radio stations. PAGASA installed a rubidium atomic clock, a GPS receiver, a time interval counter, a distribution amplifier, and
Philippine_Standard_Time
Clock regulated by a pendulum
A pendulum clock is a clock that uses a swinging weight known as a pendulum as its timekeeping element. The pendulum is an approximate harmonic oscillator
Pendulum_clock
Fundamental quantity in physics
Pendulum clocks were widely used in the 18th and 19th century. They have largely been replaced in general use by quartz and digital clocks. Atomic clocks can
Time_in_physics
English physicist (1908–1997)
collaboration with Jack Parry, the first practical atomic clock by integrating the caesium atomic standard with conventional quartz crystal oscillators
Louis_Essen
Form of particle interferometry
frequencies. Ramsey's method is used today in atomic clocks and in the SI definition of the second. Most precision atomic measurements, such as modern atom interferometers
Ramsey_interferometry
National measurement institution of the UK
computers in the late 1940s and 1950s, construction of the first accurate atomic clock in 1955, and the invention and first implementation of packet switching
National Physical Laboratory (United Kingdom)
National_Physical_Laboratory_(United_Kingdom)
Comparing widely separated telescope wavefronts
received at each antenna in the array include arrival times from a local atomic clock, such as a hydrogen maser. At a later time, the data are correlated with
Very-long-baseline interferometry
Very-long-baseline_interferometry
First commercial atomic clock
commercial atomic clock, built by the National Company, Inc. of Malden, Massachusetts. It was also the first self-contained portable atomic clock and was
Atomichron
Type of clock that displays the time with numbers
setting the time, such as using a broadcast radio time signal from an atomic clock, getting the time from an existing satellite television or computer connection
Digital_clock
Atomic master clock for the U.S. Department of Defense
The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense
Department of Defense master clock
Department_of_Defense_master_clock
Tests of special relativity
cesium-beam atomic clocks were flown around the world and the expected differences were found compared to a stationary clock. The clock hypothesis states
Experimental testing of time dilation
Experimental_testing_of_time_dilation
Precision electromechanical pendulum clock
The Shortt–Synchronome free pendulum clock is a complex precision electromechanical pendulum clock invented in 1921 by British railway engineer William
Shortt–Synchronome_clock
Science of the measurement of time
keep time: clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers, and atomic clocks are all examples
Chronometry
Partially reusable super-heavy-lift launch vehicle by SpaceX
Deep Space Atomic Clock (DSAC) Overview Archived April 12, 2019, at the Wayback Machine NASA Accessed on December 10, 2018 General Atomics Completes Ready-For-Launch
Falcon_Heavy
Intermittent adjustment to UTC
accommodate the difference between International Atomic Time (TAI), as measured precisely by atomic clocks, and observed solar time (UT1), which varies due
Leap_second
Planned NASA orbiter mission to Venus
carry the Deep Space Atomic Clock-2 as a secondary payload. The Deep Space Atomic Clock-2 is the successor to the Deep Space Atomic Clock payload flown on
VERITAS_(spacecraft)
Circuit in a computer that maintains accurate time
navigation, the classic task of a chronometer. In 2011, chip-scale atomic clocks became available. Although vastly more expensive and power-hungry (120 mW
Real-time_clock
Time of day voice service
speaking clock came directly from the time service of the Royal Observatory of Belgium. First it came from a Zeiss clock, later from an atomic clock. The
Speaking_clock
Electromechanical weight measuring instrument
measurement depends on the Kibble balance, the gravimeter, and the clock. Like the early atomic clocks, the early Kibble balances were one-of-a-kind experimental
Kibble_balance
Brand-name torsion pendulum clock
date, over 500,000 Atmos clocks have been produced. Atomic Clock Beverly Clock Clock of the Long Now Cox's timepiece List of clock types Sacks, Adam Michael
Atmos_clock
2010 studio album by Zion I
Atomic Clock is a studio album by Zion I. It was released by Gold Dust Media in 2010. It peaked at number 24 on the Billboard Heatseekers Albums chart
Atomic_Clock_(Zion_I_album)
Official time zone of Hong Kong
Caesium beam atomic clock. This system narrowed the engineering tolerance down to less than 1 millisecond. The frequency standard of the clock is based on
Hong_Kong_Time
Linear scaling of Barycentric Coordinate Time
Sun and of the Moon about the Earth. After the caesium atomic clock was invented, such clocks were used increasingly from the late 1950s as secondary
Barycentric_Dynamical_Time
First global radio navigation system for aircraft
synchronizing very distant stations was solved with the introduction of the atomic clock in the 1950s, which became commercially available in portable form by
Omega_(navigation_system)
Detail of the global positioning system
mobile GPS devices. See also Assisted GPS. The satellites' atomic clocks experience noise and clock drift errors. The navigation message contains corrections
Error analysis for the Global Positioning System
Error_analysis_for_the_Global_Positioning_System
NIST-7 was the atomic clock used by the United States from 1993 to 1999. It was one of a series of Atomic Clocks at the National Institute of Standards
NIST-7
Swiss timekeeping products manufacturer
precision timekeeping electronics including atomic clocks, Precision Time Protocol hardware and GNSS clocks. Oscilloquartz's portfolio also includes its
Oscilloquartz
Mechanism for regulating the speed of clocks
in all clocks, which include pendulums, balance wheels, the quartz crystals used in quartz watches, and even the vibrating atoms in atomic clocks, are in
Pendulum
Japanese regional navigation satellite system
QZSS was to carry two types of space-borne atomic clocks; a hydrogen maser and a rubidium (Rb) atomic clock. The development of a passive hydrogen maser
Quasi-Zenith_Satellite_System
Time signal transmitted from Anthorn Radio Station in Cumbria, England
Kingdom's national time reference. The time signal is derived from three atomic clocks installed at the transmitter site, and is based on time standards maintained
Time_from_NPL_(MSF)
Device only intended to turn itself off
plane Lever Pulley Screw Wedge Wheel and axle Clocks Atomic clock Chronometer Pendulum clock Quartz clock Compressors and pumps Archimedes' screw Eductor-jet
Useless_machine
Tall, freestanding, weight-driven pendulum clock
clock (also a longcase clock, tall-case clock, grandfather's clock, hall clock or floor clock) is a tall, freestanding, weight-driven pendulum clock,
Grandfather_clock
Time zone
more than 0.9 seconds. NMC maintains five caesium atomic clocks and one hydrogen maser atomic clock. The IANA time zone database contains one zone for
Singapore_Time
Signal with equal energy per octave
for the averaging to converge to a definite value. For example, a 2013 atomic clock achieved σ ( 25000 seconds ) = 1.6 × 10 − 18 {\displaystyle \sigma (25000{\text{
Pink_noise
Device to measure the passage of time
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically
Hourglass
Radio-controlled wristwatch brand
services around the world. These signals transmit the time measured by atomic clocks accurate to one second in millions of years. By synchronizing daily
Casio_Wave_Ceptor
Time zone observed in India; UTC+05:30
and official use. The signals are based on atomic clocks and synchronised with the worldwide system of clocks that support Coordinated Universal Time. Features
Indian_Standard_Time
Clock based on pulsar radio beams
in Toruń. Another goal of the clock is to create a pulsar-based timescale surpassing the accuracy of all atomic clocks. Its place of construction was
Pulsar_clock
Measurement unit for time
of time ever measured". Retrieved 2020-10-17. "Atomic time | Atomic Time | Accuracy, Measurement, Clocks | Britannica". www.britannica.com. Retrieved 2025-11-18
Unit_of_time
International Earth observation satellite mission
instrument. T2L2 is used to synchronize atomic clocks at ground stations, and to calibrate the on-board clock of the Jason-2 DORIS instrument. On 6 November
OSTM/Jason-2
Global radio telescope array
Each antenna, spread out over vast distances, has an extremely precise atomic clock. Analogue signals collected by the antenna are converted to digital signals
Event_Horizon_Telescope
Networking protocol for clock synchronization
clocks and oscillators Clock network – Set of clocks that synchronized to same time International Atomic Time – Time standard based on atomic clocks IRIG
Network_Time_Protocol
Electromagnetic radiation with wavelengths from 1 m to 1 mm
and satellite ground stations. The maser led to the development of atomic clocks, which keep time using a precise microwave frequency emitted by atoms
Microwave
Time standard for astronomical observations from the Earth
currently on the caesium atomic clock, but TT is not itself defined by atomic clocks. It is a theoretical ideal, and real clocks can only approximate it
Terrestrial_Time
Clock used on ships to aid in navigation
in practice. Christiaan Huygens, following his invention of the pendulum clock in 1656, made the first attempt at a marine chronometer in 1673 in France
Marine_chronometer
Type of quantum state
atoms can be used to improve the precision of atomic clocks. This is an important problem in atomic clocks and other sensors that use small ensembles of
Squeezed_coherent_state
General-relativistic effect
general relativity. This effect has been demonstrated by noting that atomic clocks at differing altitudes (and thus different gravitational potential)
Gravitational_time_dilation
American physicist
pioneered and designed several ion-trap atomic clocks including the physics package for the NASA Deep Space Atomic Clock (DSAC) Technology Demonstration Mission
John_Prestage
Region of England
atomic clock, in 1955. During the war he invented the cavity resonance wavemeter to find the first accurate value of the speed of light. The atomic clock
East_Midlands
Line dividing one calendar day from the next
convenience. People traveling westward around the world must set their clocks: Back by one hour for every 15° of longitude crossed, and Forward by 24
International_Date_Line
1938 experiment confirming relativistic time dilation
optical atomic clocks emitted frequencies in the petahertz (1 PHz = 1015 Hz) range and had frequency uncertainties in the 10−17 range. With these clocks, it
Ives–Stilwell_experiment
minutes ahead of NZST. In the late 1940s the atomic clock was developed and several laboratories began atomic time scales. A new time scale known as Coordinated
Time_in_New_Zealand
ATOMIC CLOCK
ATOMIC CLOCK
Boy/Male
Anglo Saxon
Horrible.
Male
Japanese
(富) Japanese name TOMIO means "treasured man."
Boy/Male
Hindu
The soul
Girl/Female
Indian
Atom
Boy/Male
Gujarati, Hindu, Indian
Topic; Subject
Boy/Male
Czechoslovakian
Boy/Male
Indian
An Atom's Warrior
Male
Hungarian
Pet form of Hungarian Tamás, TOMI means "twin."
Boy/Male
Hindu, Indian
Relating to the Soul
Boy/Male
Tamil
Atom
Girl/Female
Tamil
Atom
Girl/Female
Tamil
Anu Keerthi | அநà¯Â கிரதீ Â
Atom
Anu Keerthi | அநà¯Â கிரதீ Â
Girl/Female
Hindu
Atom
Boy/Male
Hindu
Atom
Girl/Female
British, English, French, Italian
Lovely
Boy/Male
African, Australian, Finnish, Japanese
The People; Twin; Happy Child
Girl/Female
Gujarati, Hindu, Indian, Marathi, Telugu
Sunrise; Comic
Girl/Female
Hebrew
Strong as an oak.
Boy/Male
Hindu
Atom
Boy/Male
Tamil
Atom
ATOMIC CLOCK
ATOMIC CLOCK
Girl/Female
Arabic
Variant of Rafi'a; Exalted; Sublime
Girl/Female
Muslim
Beloved
Boy/Male
Biblical
Who demands his death.
Female
Hebrew
(ש×ï‹×©×Ö·× Ö¼Ö¸×”) Feminine form of Hebrew unisex Shoshan, SHOSHANA means "lily."
Boy/Male
Latin American
Form of Jovan 'Father of the sky.
Girl/Female
Indian
Inseparable
Boy/Male
Tamil
Srinivasa | à®·à¯à®°à¯€Â நீவாஸா Â
Lord Venkateshwara, Residence of Goddess of wealth, Abode of wealth
Girl/Female
American, Australian, British, English, Greek, Latin
Combination of Georgia and Anna; Gracious Farmer; Farmer; Variant of Georgia
Girl/Female
Indian, Punjabi, Sikh
Reside; Pervade
Girl/Female
Muslim/Islamic
The pollen in the flower honey, sweet
ATOMIC CLOCK
ATOMIC CLOCK
ATOMIC CLOCK
ATOMIC CLOCK
ATOMIC CLOCK
a.
Of or pertaining to atoms.
n.
An atom; a mite; a pigmy.
a.
Relating to the etymon; as, an etymic word.
n.
The doctrine of atoms. See Atomic philosophy, under Atomic.
n.
An Adonic verse.
a.
Containing two atoms.
a.
Of or pertaining to atoms; relating to atomism.
v. t.
To reduce to atoms, or to fine spray.
n.
One who holds to the atomic philosophy or theory.
a.
Unaccented; as, an atonic syllable.
a.
Aeolian, 1; as, the Aeolic dialect; the Aeolic mode.
n.
Nomic spelling.
a.
Characterized by atony, or want of vital energy; as, an atonic disease.
v. t.
To reduce to atoms.
a.
Produced without sexual union; as, agamic or unfertilized eggs.
a.
Having two replaceable atoms or radicals.
a.
Pertaining to, or characterized by, aptotes; uninflected; as, aptotic languages.
a.
Pertaining to azote, or nitrogen; formed or consisting of azote; nitric; as, azotic gas; azotic acid.
a.
Alt. of Atomical
n.
A tonic element or letter; a vowel or a diphthong.