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time : ウィキペディア英語版
time

Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.〔
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(Merriam-Webster Dictionary ) the measured or measurable period during which an action, process, or condition exists or continues : duration; a nonspatial continuum which is measured in terms of events that succeed one another from past through present to future
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Compact Oxford English Dictionary A limited stretch or space of continued existence, as the interval between two successive events or acts, or the period through which an action, condition, or state continues. (1971)
〕〔〔 Time is often referred to as the fourth dimension, along with the three spatial dimensions.〔"Newton did for time what the Greek geometers did for space, idealized it into an exactly measurable dimension." ''About Time: Einstein's Unfinished Revolution'', Paul Davies, p. 31, Simon & Schuster, 1996, ISBN 978-0684818221

Time has long been a major 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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Adam Frank, ''Cosmology and Culture at the Twilight of the Big Bang'', "the time we imagined from the cosmos and the time we imagined into the human experience turn out to be woven so tightly together that we have lost the ability to see each of them for what it is." p. xv, Free Press, 2011, ISBN 978-1439169599
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St. Augustine, ''Confessions'', Simon & Brown, 2012, ISBN 978-1613823262

Nevertheless, diverse fields such as business, industry, sports, the sciences, and the performing arts all incorporate some notion of time into their respective measuring systems.〔
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108 pages

Some simple definitions of time include "time is what clocks measure",〔〔 which is a problematically vague and self-referential definition that utilizes the device used to measure the subject as the definition of the subject, and "time is what keeps everything from happening at once", which is without substantive meaning in the absence of the definition of simultaneity in the context of the limitations of human sensation, observation of events, and the perception of such events.〔
Chapter 5. Cummings repeated this sentence in several of his novellas. Sources, such as (this one ), attribute it to his earlier work, ''The Time Professor'', in 1921. Before taking book form, several of Cummings's stories appeared serialized in magazines. The first eight chapters of his ''The Girl in the Golden Atom'' (appeared ) in ''All-Story Magazine'' on 15 March 1919. In the (novel version ) the quote about time appears in (Chapter V ).
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, (What does a man possess? page 47 )
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, (Page 796, quoting Wheeler from the American Journal of Physics, 1978 )
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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 independent of events, in which events occur in sequence.
Sir Isaac Newton subscribed to this realist view, and hence it is sometimes referred to as Newtonian time.〔
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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. This second view, in the tradition of Gottfried Leibniz

and Immanuel Kant,〔
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holds that ''time'' is neither an event nor a thing, and thus is not itself measurable nor can it be travelled.
Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities. Time is used to define other quantities—such as velocity—so defining time in terms of such quantities would result in circularity of definition.〔Duff, Okun, Veneziano, ''ibid.'' p. 3. "There is no well established terminology for the fundamental constants of Nature. … The absence of accurately defined terms or the uses (i.e., actually misuses) of ill-defined terms lead to confusion and proliferation of wrong statements."

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.
Furthermore, it may be that there is a subjective component to time, but whether or not time itself is "felt", as a sensation, or is a judgment, is a matter of debate.〔
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Lehar, Steve. (2000). (The Function of Conscious Experience: An Analogical Paradigm of Perception and Behavior ), ''Consciousness and Cognition''.


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 by measuring the electronic transition frequency of 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.
== Temporal measurement and history ==

Temporal measurement, chronometry, takes two distinct period forms: the calendar, a mathematical tool for organizing intervals of time,〔

and the clock, a physical mechanism that counts the 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「time」の詳細全文を読む



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