Timekeeping

A metronome () is a device that produces an audible click or other sound at a uniform interval that can be set by the user, typically in beats per minute (BPM). Metronomes may also include synchronized visual motion, such as a swinging pendulum or a blinking light. Musicians—and others including dancers, athletes, and health professionals—often practise with a metronome to improve their timing, especially the ability to maintain a steady tempo with a regular beat or pulse. Composers and conductors often use numerical metronome markings to communicate their preferred tempos to musicians prepari

extra second inserted or removed to keep civil time in sync with the Earth's rotation

timepiece in which time is measured by the flow of liquid into a vessel

American astronomer (1835–1909)

apparent solar time minus mean solar time

REDIRECT Chronometry

elapsed time between two events as measured by a clock that passes through both events

history of devices for measuring time

thumb|upright=0.65|The hourglass is often used as a symbol representing the passage of time. thumb|Clocks; a watch-maker seated at his workbench Chronometry or horology () is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. Horology usually refers specifically to the study of mechanical timekeeping devices, while chronometry is broader in scope, also including biological behaviours with respect to time (biochronometry), as well as the dat

specification for measuring time

electromechanical display device

proposed approaches to tracking date and time on the planet Mars

former organization responsible for measuring Universal Time

right|thumb|Moondial at Queens' College, Cambridge, showing the table of corrections for the phase of the moon

ancient Chinese time unit, 12 double-hour periods

fundamental quantity in physics

A timekeeper is a person that measures the passage of time. They may have additional functions in sports and business.

thumb|The muvakkithane ("lodge of the muwaqqit") in [[Hagia Sophia, Istanbul]]

clock that uses a torsion pendulum to keep time

electromechanical, digital time keeping device

game mechanics

brand-name torsion pendulum clock

Event occuring every 1024 weeks

hour system where the duration of an hour depends on the date

Hebrew term ascribed to an hour of a 12-hour day and how it is to be reckoned

sundial listing the canonical hours

Form of race timing