| Description: | Time waits for no one Wallpaper |
| Category | GREAT DETAILS WALLPAPERS |
| Image Filesize | 948.9 KB |
| Date: | 30.01.2012 00:30 |
| Last view date | 24.05.2012 06:21 |
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Spacetime,
Motion " Space
Event " Continuum
Time Travel " (Grandfather Paradox)
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.[1] Time is a component quantity of many measurements used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience.[2][3][4] The temporal position of events with respect to the transitory present is continually changing; events happen, then are located further and further in the past. Time has been a major subject of religion, philosophy, and science, but defining it in a manner applicable to all fields of study without circularity has consistently eluded scholars.[5] A simple definition states that "time is what clocks measure".[2][5]
Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities " such as velocity " so defining time in terms of such quantities would result in circularity of definition.[6] An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.
Two contrasting viewpoints on time divide many prominent philosophers. One view is that time is part of the fundamental structure of the universe, a dimension in which events occur in sequence. Sir Isaac Newton subscribed to this realist view, and hence it is sometimes referred to as Newtonian time.[7][8] Time travel, in this view, becomes a possibility as other "times" persist like frames of a film strip, spread out across the time line. The opposing view is that time does not refer to any kind of "container" that events and objects "move through", nor to any entity that "flows", but that it is instead part of a fundamental intellectual structure (together with space and number) within which humans sequence and compare events (such as, change of conditions within an ever-present, allowing an endless 'succession' of changes). This second view, in the tradition of Gottfried Leibniz[9] and Immanuel Kant,[10][11] holds that time is neither an event nor a thing, and thus is not itself measurable nor can it be travelled.
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. Examples include the apparent motion of the sun across the sky, the phases of the moon, the swing of a pendulum, and the beat of a heart. Currently, the international unit of time, the second, is defined in terms of radiation emitted by caesium atoms (see below). Time is also of significant social importance, having economic value ("time is money") as well as personal value, due to an awareness of the limited time in each day and in human life spans.
Ray Cummings, an early writer of science fiction, wrote in 1922, "Time... is what keeps everything from happening at once",[12] a sentence repeated by scientists such as C. J. Overbeck,[13] and John Archibald Wheeler.[14][15]
Temporal measurement, or chronometry, takes two distinct period forms: the calendar, a mathematical abstraction for calculating extensive periods of time,[16] and the clock, a physical mechanism that counts the ongoing passage of time. In day-to-day life, the clock is consulted for periods less than a day, the calendar, for periods longer than a day. Increasingly, personal electronic devices display both calendars and clocks simultaneously. The number (as on a clock dial or calendar) that marks the occurrence of a specified event as to hour or date is obtained by counting from a fiducial epoch " a central reference point.
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