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Time is a component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects. Time has been a major subject of religion, philosophy, and science, but defining it in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars.

In physics as well as in other sciences, time is considered one of the few fundamental 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. 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.

Among prominent philosophers, there are two distinct viewpoints on time. One view is that time is part of the fundamental structure of the universe, a dimension in which events occur in sequence. Time travel, in this view, becomes a possibility as other "times" persist like frames of a film strip, spread out across the time line. Sir Isaac Newton subscribed to this realist view, and hence it is sometimes referred to as Newtonian time. 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[5] and Immanuel Kant, 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.
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review by . February 28, 2010
posted in Inspirations
The Circle of Time
They say time is money and anyone who helps others save time has the potential to earn the currencies of the world. Totally true though how significant that is is up to each individuals. We cannot control time although we can control the way we use our time. What is more significant though is how limited we have of this commodity which we call time.            The recent earthquakes illustrate that. The recent sicknesses we have had illustrate that. Although …
review by . December 18, 2009
How one manages his/her time will tell you an awful lot about a person.
Carl Sandburg   US biographer & poet (1878 - 1967) "Time is the coin of your life. It is the only coin you have, and only you can determine how it will be spent. Be careful lest you let other people spend it for you." As we come to the end of another year and think about New Year's Resolutions the subject of "time" immediately comes to mind.  For me the above quotation from Carl Sandburg seems to succinctly sum up the predicament …
Quick Tip by . May 16, 2011
We may squander away the money and we see the aftereffects. With time though, it simply slips by, bit by bit, day by day, until one day when we finally realized how much time has gone by. Oh no, it's too late then! We missed all those opportunities. It's been said "We are defined by opportunities, even the ones we miss"... We lose time, we lose opportunities, and we lose our chance to define ourselves right! It's time to take stock of time. Real important, must remember this …
Quick Tip by . February 28, 2010
Everyone has the same amount in a day but not everyone is granted equally in a lifetime. Time speeds up as one grows older!
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