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Earth Clock is a computer program that will display a map of the Earth showing the zones where is day and where is night. It was released by Xentax Foundation
Earth_clock
Thought experiment in special relativity
which the Earth clocks age less than the traveller. For example, if the Earth clocks age 1 day less on each leg, the amount that the Earth clocks will lag
Twin_paradox
Instrument for measuring, keeping or indicating time
A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals
Clock
Medieval astronomical clock in the Czech Republic
The Prague astronomical clock, or Prague Orloj (Czech: Pražský orloj [praʃskiː orloj]), is a medieval astronomical clock attached to the Old Town Hall
Prague_astronomical_clock
Public countdown of time until 1.5°C of global warming
show the time remaining until the earth reach important global warming levels. There are at least two public climate clock projects and websites, based on
Climate_Clock
Measured time difference as explained by relativity theory
Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity, a consequence of special relativity,
Time_dilation
Specially designed clock that keeps track of the Moon's apparent motion around the Earth
A tide clock is a specially designed clock that keeps track of the Moon's apparent motion around the Earth. Along many coastlines, the Moon contributes
Tide_clock
Clock that monitors the resonant frequency of atoms
clock time to stay within one second of Earth's rotation. The accurate time-keeping capabilities of atomic clocks are also used for navigation by satellite
Atomic_clock
Clock designed to keep time for 10,000 years
90384°W / 31.44841; -104.90384 The Clock of the Long Now, also called the 10,000-year clock, is a mechanical clock under construction that is designed
Clock_of_the_Long_Now
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
SI unit of time
second based on fundamental properties of nature with caesium clocks. As the speed of Earth's rotation varies and is slowing ever so slightly, a leap second
Second
Symbol which represents the likelihood of a human-made global catastrophe
The Doomsday Clock is a symbol that represents the estimated likelihood of a human-made global catastrophe, in the opinion of the nonprofit organization
Doomsday_Clock
Chronology of development from 1905
round-trip clock experiments, including an experiment in which a human observer traveled for 300 Earth years on a circular path away and back to Earth, while
History_of_the_twin_paradox
3D Internet global map program
Google Earth is a web and computer program created by Google that renders a 3D representation of Earth based primarily on satellite imagery. The program
Google_Earth
Timekeeping system on Earth relative to the celestial sphere
a typical clock (using mean Solar time) measures a slightly longer cycle, affected not only by Earth's axial rotation but also by Earth's orbit around
Sidereal_time
Clock displaying astronomical information
An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions
Astronomical_clock
Archaic conception of Earth's shape
Flat Earth is an archaic and scientifically disproven conception of the Earth's shape as a plane or disk. Many ancient societies subscribed to a flat-Earth
Flat_Earth
Mechanism for regulating the speed of clocks
over 0.5% across the surface of the Earth. The pendulum in a clock is disturbed by the pushes it receives from the clock movement, so freeswinging pendulums
Pendulum
Where a clock does not run at same rate as reference clock
and computing, clock drift refers to several related phenomena where a clock does not run at exactly the same rate as a reference clock. That is, after
Clock_drift
Detail of the global positioning system
constant movement of GPS clocks relative to the Earth-centered, non-rotating approximately inertial reference frame. In short, the clocks on the satellites are
Error analysis for the Global Positioning System
Error_analysis_for_the_Global_Positioning_System
Precision electromechanical pendulum clock
the first clock to be a more accurate timekeeper than the Earth itself; it was used in 1926 to detect tiny seasonal changes in the Earth's rotation rate
Shortt–Synchronome_clock
Clock
number of times. The interior dial of the clock proposes a geocentric model of the universe (above right). The earth is at the centre. A background of the
Wells_Cathedral_clock
General-relativistic effect
clocks at differing altitudes (and thus different gravitational potential) will eventually show different times. The effects detected in such Earth-bound
Gravitational_time_dilation
Proposed approaches to tracking date and time on the planet Mars
variation than that of Earth: on Mars, the Sun can run 51 minutes slower or 40 minutes faster than a Martian clock (on Earth, the corresponding figures
Timekeeping_on_Mars
Physical acceleration experienced by an object
(~12 years on Earth clocks), round trips to the Milky Way's central black hole of about 40 years (~54,000 years elapsed on earth clocks), and round trips
Proper_acceleration
these two clocks (being fundamentally different) will provide a test of "local position invariance." Comparisons between the space and earth clocks will yield
Primary Atomic Reference Clock in Space
Primary_Atomic_Reference_Clock_in_Space
Clock type
Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. The crystal oscillator, controlled
Quartz_clock
Any of the fifteen lanthanides plus scandium and yttrium
Rare-earth elements in the periodic table The rare-earth elements (REE), also called rare-earth metals, or rare earths, are a set of 17 nearly indistinguishable
Rare-earth_element
Natural satellite orbiting Earth
year (roughly the rate at which human fingernails grow). Atomic clocks show that Earth's Day lengthens by about 17 microseconds every year, slowly increasing
Moon
Mechanical model of the Solar System
normal mechanical clock could be used to produce an extremely simple orrery to demonstrate the principle, with the Sun in the centre, Earth on the minute
Orrery
Human protein and coding gene
conditions in the early history of the Earth's formation, such as UV irradiation, may have led to the diversification of clock genes in prokaryotes in response
CLOCK
Time counting system
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before
12-hour_clock
Timepiece in which time is measured by the flow of liquid into or out of a vessel
A water clock, or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water';
Water_clock
Seasonal change of clock settings
of advancing clocks to (in theory) make better use of the longer daylight available during summer by having darkness fall at a later clock time. The typical
Daylight_saving_time
Rotation of Earth around its axis
Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space
Earth's_rotation
1991). "Of clocks and rocks - The four aeons of Earth". Episodes. 14 (4): 327–330. doi:10.18814/epiiugs/1991/v14i4/003. Witze, Alexandra. "Earth's Lost History
Geological_history_of_Earth
Relative direction using a dial
A clock position, or clock bearing, is the direction of an object observed from a vehicle, typically a vessel or an aircraft, relative to the orientation
Clock_position
events of Doomsday Clock. Characters' last known status is listed below. An alternate version of the team appears in the New 52 series Earth-2. Two alternate
List of Justice Society of America members
List_of_Justice_Society_of_America_members
Records of Earth's development
ISBN 978-0-12-373972-8. Steenhuysen, Julie (May 21, 2009). "Study turns back clock on origins of life on Earth". Reuters. Reuters. Retrieved May 21, 2009. "Space Topics:
History_of_Earth
Science Museum in Makkah, Saudi Arabia
The Clock Tower Museum is a museum occupying the top four floors of the Mecca Royal Clock Tower in Mecca, Saudi Arabia. The museum, located at the highest
Clock_Tower_Museum
Hypothetical travel between stars or planetary systems
years from Earth) and back in 40 years ship-time. But the speed according to Earth clocks will always be less than 1 light year per Earth year, so, when
Interstellar_travel
Test of relativistic time dilation
the center of the Earth (because this is an inertial frame), a clock aboard the plane moving eastward, in the direction of the Earth's rotation, had a greater
Hafele–Keating_experiment
Primary time standard globally used to regulate clocks and time
Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis
Coordinated_Universal_Time
List of alternate universes set in the DC Comics media
In Doomsday Clock (2019) it was revealed that previous incarnations of DC Universe, such as Pre-Crisis Earth-One and New 52's Prime Earth still exist
List_of_DC_Multiverse_worlds
Time standard used in astronomical ephemerides
1968. L V Morrison, F R Stephenson (2004), "Historical values of the Earth's clock error ΔT and the calculation of eclipses", Journal for the History of
Ephemeris_time
practical use elsewhere. In 1932, a quartz clock able to measure small weekly variations in the rotation rate of the Earth was developed. Their inherent physical
History of timekeeping devices
History_of_timekeeping_devices
Time-telling device
local solar time only. To obtain the national clock time, three corrections are required: The orbit of the Earth is not perfectly circular and its rotational
Sundial
Time coordinate in relativity theory
rotation. Due to gravitational potential at Earth's surface, TCG advances faster than Earth-bound atomic clocks. Terrestrial Time (TT): A scaled version
Coordinate_time
Time of day voice service
A speaking clock or talking clock is a live or recorded human voice service, usually accessed by telephone, that gives the correct time. The first telephone
Speaking_clock
Mechanism for regulating the speed of clocks
watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands. The
Escapement
Multiple proofs regarding Earth's approximately spherical shape
over the year, due to the elliptical nature of Earth's orbit, and its tilt. The differences in clock time between cities was not generally a problem
Empirical evidence for the spherical shape of Earth
Empirical_evidence_for_the_spherical_shape_of_Earth
Movement in the same direction as a clock's hands
center of earth and on the same ray"). Clocks traditionally follow this sense of rotation because of the clock's predecessor: the sundial. Clocks with hands
Clockwise
Period of time for the ecliptic longitude of the Sun to increase 360°
of the Earth is being retarded by tides. This could be verified by observation only in the 1920s with the very accurate Shortt–Synchronome clock and later
Tropical_year
Large clock in Berlin, Germany
The World Clock (German: Weltzeituhr; pronounced [ˈvɛltt͡saɪ̯tˌʔuːɐ̯] ), also known as the Urania World Clock (Urania-Weltzeituhr), is a large turret-style
World_Clock_(Alexanderplatz)
Ratio in relativity
(~12 years on Earth clocks), round trips to the Milky Way's central black hole of about 40 years (~54,000 years elapsed on Earth clocks), and round trips
Proper_velocity
Biological mechanism that controls circadian rhythm
synchronized with solar time. Such a clock's in vivo period is necessarily almost exactly 24 hours (the earth's current solar day). In most living organisms
Circadian_clock
Superhero comic book published by DC Comics
Doomsday Clock is a 2017–2019 superhero comic book limited series published by DC Comics, written by Geoff Johns with art by penciller Gary Frank and
Doomsday_Clock_(comics)
Internationally accepted civil calendar
Morrison, L. V.; Stephenson, F. R. (2004). "Historical values of the Earth's clock error ΔT and the calculation of eclipses". Journal for the History of
Gregorian_calendar
Time standard based on the slowing rotation of the Earth
Due to Zonal Tides". Paris: Earth Orientation Center. Retrieved 2 October 2011. Galison, Peter (2003). Einstein's clocks, Poincaré's maps: Empires of
Universal_Time
Atomic clock used for radio navigation in space
collected and processed here on Earth (a two-way link) for most deep space navigation applications. The Deep Space Atomic Clock (DSAC) is a miniaturized and
Deep_Space_Atomic_Clock
Specification for measuring time
crystal oscillator clocks could measure time more accurately than the rotation of the Earth. Metrologists also knew that Earth's orbit around the Sun
Time_standard
DC Comics superhero
appears in Earth 2 #3 (2012) with a completely redesigned sleek, solid green suit with no cape. In the 2017–2019 Doomsday Clock event, Prime Earth Alan is
Alan_Scott
Time standard based on atomic clocks
notional passage of proper time on Earth's geoid. TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories
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
The Passemant astronomical clock is an astronomical clock designed by Claude-Simeon Passemant in the eighteenth century. It is displayed in the Salon de
Passemant_astronomical_clock
Type of clock
are caused by the rotation and orientation of Earth on its axis and its orbit around the Sun. The clock normally also displays the phase of the Moon and
Tellurion
Watchmen character
character in the DC Universe. He was one of the main characters in the Doomsday Clock miniseries, published from 2017 to 2019. Manhattan made his first live-action
Doctor_Manhattan
Calculation of elapsed time by the apparent position of the sun
24 hours of clock time. This change is quantified by the equation of time, and is due to the eccentricity of Earth's orbit (as in, Earth's orbit is not
Solar_time
14th-century astronomical clock in Ottery St Mary, England
Ottery St Mary Astronomical Clock is a 14th-century astronomical clock in St Mary's Church, Ottery St Mary, in Devon in south-west England. The south transept
Ottery St Mary astronomical clock
Ottery_St_Mary_astronomical_clock
15th-century astronomical clock in Lund Cathedral
astronomical clock, occasionally and at least since the 16th century referred to as Horologium mirabile Lundense (Latin: "the wonderful clock in Lund"),
Lund_astronomical_clock
2002 survival horror video game
Clock Tower 3 is a survival horror video game co-produced by Capcom and Sunsoft for the PlayStation 2. Released in 2002, it is the fourth installment
Clock_Tower_3
Tests of special relativity
a clock C traveling between two synchronized laboratory clocks A and B, as seen by a laboratory observer, is slowed relative to the laboratory clock rates
Experimental testing of time dilation
Experimental_testing_of_time_dilation
Shape of the Moon's sunlit portion as viewed from Earth
tidally locked to Earth, the cycle of phases takes one lunar month and moves across the same side of the Moon, which always faces Earth. In common usage
Lunar_phase
Line dividing one calendar day from the next
Earliest time on Earth here means that calendar day and clock time in this time zone is least advanced (or the "oldest ") on Earth and that this place
International_Date_Line
Comic book character
Clock #1 Doomsday Clock #2 Doomsday Clock #3 Doomsday Clock #5 Doomsday Clock #7 Doomsday Clock #8 Doomsday Clock #9 Doomsday Clock #9 Doomsday Clock
Adrian_Veidt
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
Apparent solar time minus mean solar time
solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would
Equation_of_time
Proposed time standard
Arabia (39°49′34″ E of the Greenwich Meridian) as its Prime Meridian. A clock based on this meridian would be at approximately UTC+02:39:18.3. 40° The
Mecca_Time
Dissimilar electrodes in soil or sea
a clock. Carl Friedrich Gauss, who had researched Earth's magnetic field, and Carl August von Steinheil, who built one of the first electric clocks and
Earth_battery
Astronomical clock in the cathedral of Lyon, France
and position of the Moon, Sun, and Earth, as well as the stars. The first documentary evidence of an astronomical clock in the cathedral is from 1383 but
Lyon_astronomical_clock
14th-century astronomical clock in Wimborne Minster, England
astronomical clock is a fourteenth-century astronomical clock in Wimborne Minster in Dorset, regarded as "one of the most ancient working clocks in Europe
Wimborne Minster astronomical clock
Wimborne_Minster_astronomical_clock
Park in Hong Kong
features three timepieces known as the Heaven Clock, Earth Clock, and Human Clock. At scheduled times, the clocks take part in a mechanical display in which
Nina_Park
Networking protocol for clock synchronization
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data
Network_Time_Protocol
American counterculture publication
The Whole Earth Catalog (WEC) was an American counterculture magazine and product catalog. Stewart Brand, a biologist, photographer and writer, conceived
Whole_Earth_Catalog
Clock tower in Sighisoara, Romania
The Clock Tower (Romanian: Turnul cu Ceas, German: der Stundturm) of Sighișoara in Mureș County, Transylvania, Romania, is the main entry point to the
Sighișoara_Clock_Tower
Multiple fictional characters, supervillains published by DC Comics
The Clock King is the name of primarily three supervillains appearing in American comic books published by DC Comics. The first Clock King debuted in
Clock_King
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 and
Indian Regional Navigation Satellite System
Indian_Regional_Navigation_Satellite_System
Measure of variation of solar time from atomic time
ISBN 978-3-527-40780-4 Morrison, L.V. & Stephenson, F. R. "Historical values of the Earth's clock error ΔT and the calculation of eclipses" (pdf, 862 KB), Journal for
ΔT_(timekeeping)
Time standard for astronomical observations from the Earth
in the rotation of Earth. The unit of TT is the SI second, the definition of which is based currently on the caesium atomic clock, but TT is not itself
Terrestrial_Time
Time standard used in astronomy
of the Earth. It is equivalent to the proper time experienced by a clock at rest in a coordinate frame co-moving with the center of the Earth [citation
Geocentric_Coordinate_Time
The gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution
Gravity_of_Earth
Kinetic sculpture in Hornsby, Sydney, Australia
Water Clock, titled Man, Time and the Environment, is a piece of kinetic sculpture, a decorative fountain and an occasionally functional clock in the
Hornsby_Water_Clock
American project developer (born 1938)
Built, 1994. ISBN 0-670-83515-3 The Clock of the Long Now: Time and Responsibility, 1999. ISBN 0-465-04512-X Whole Earth Discipline: An Ecopragmatist Manifesto
Stewart_Brand
Total number of living humans on Earth
– World countries mapped by population size Population clocks U.S. and World Population Clock (US Census Bureau) World Population Clock – Worldometer
World_population
Astronomical Clock (Czech: Olomoucký orloj) is part of the northern wall of the town hall of Olomouc, Czech Republic. The astronomical clock was built in
Olomouc_astronomical_clock
Alias for the UTC+00:00 time zone
Observatory. The daily rotation of the Earth is irregular (see ΔT) and has a slowing trend; therefore atomic clocks constitute a much more stable timebase
Greenwich_Mean_Time
Intermittent adjustment to UTC
precisely by atomic clocks, and observed solar time (UT1), which varies due to irregularities and long-term slowdown in the Earth's rotation. The UTC time
Leap_second
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. Like other
Optical_clock
Primary frequency standard
caesium-133 atoms is used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in
Caesium_standard
Time offset from UTC of +14
enter a New Year. It is also referred to as the "latest time zone" on Earth, as clocks in it always show the 'latest' (i.e., most advanced) time of all time
UTC+14:00
travel, tourism, insurance
EARTH CLOCK
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