17 Facts About Time

1.

Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future.

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2.

Time is often referred to as a fourth dimension, along with three spatial dimensions.

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3.

Time has long been an important subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars.

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4.

Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities.

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5.

Time is used to define other quantities, such as velocity, so defining time in terms of such quantities would result in circularity of definition.

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6.

Time is of significant social importance, having economic value as well as personal value, due to an awareness of the limited time in each day and in human life spans.

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7.

Universal Time is mean solar time at 0° longitude, computed from astronomical observations.

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8.

Terrestrial Time is a theoretical ideal scale realized by TAI.

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9.

Barycentric Dynamical Time is an older relativistic scale that is still in use.

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10.

Time says that time is a period of motion of the heavenly bodies.

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11.

Time was designated by Kant as the purest possible schema of a pure concept or category.

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12.

In 5th century BC Greece, Antiphon the Sophist, in a fragment preserved from his chief work On Truth, held that: "Time is not a reality, but a concept (noema) or a measure (metron).

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13.

Time as an illusion is a common theme in Buddhist thought.

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14.

Time showed that this postulate, together with a reasonable definition for what it means for two events to be simultaneous, requires that distances appear compressed and time intervals appear lengthened for events associated with objects in motion relative to an inertial observer.

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15.

Time has historically been closely related with space, the two together merging into spacetime in Einstein's special relativity and general relativity.

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16.

Time is then defined as the ensemble of the indications of similar clocks, at rest relative to K, which register the same simultaneously.

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17.

Time travel has been a plot device in fiction since the 19th century.

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