Jump to navigation Jump to search For the concept in physics, see Time in physics. The flow of sand in an hourglass can be used to measure the passage of time. It also concretely represents the present as being between the past and the future. Time has long been an important subject of study speed dating events in st albans religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars.

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Time in physics is unambiguously operationally defined as “what a clock reads”. Temporal measurement has occupied scientists and technologists, and was a prime motivation in navigation and astronomy. Periodic events and periodic motion have long served as standards for units of time. Generally speaking, methods of temporal measurement, or chronometry, take two distinct forms: the calendar, a mathematical tool for organising intervals of time, and the clock, a physical mechanism that counts the passage of time.

Artifacts from the Paleolithic suggest that the moon was used to reckon time as early as 6,000 years ago. The reforms of Julius Caesar in 45 BC put the Roman world on a solar calendar. During the French Revolution, a new clock and calendar were invented in attempt to de-Christianize time and create a more rational system in order to replace the Gregorian calendar. A large variety of devices have been invented to measure time. The study of these devices is called horology.