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. Time is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. Time is often referred to as the fourth dimension, along with the three spatial dimensions.
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. 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. Two contrasting viewpoints on time divide 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. 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 and Immanuel Kant, holds that time is neither an event nor a thing, and thus is not itself measurable nor can it be travelled.
Time in physics is unambiguously operationally defined as "what a clock reads". 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. 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.
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.

View More On Wikipedia.org
  1. rdb241

    It was only a matter of time

    This is really cool!
  2. C

    I am biding my time to order a Gerber Guardian.

    I believe that this will be what I have been seeking in a "boot knife" as I can hide it on a shoulder harness (down the back of my neck) with a dark windbreaker covering it. Does anyone else own one?
  3. fmiller

    first time practical competition...?

    Absolute noob here, please be gentle. I'm trying to make the move from "messing around at the range" to "training in a direction" and as much as I hate competitions I know that competing is the only way to really improve. So I'm looking for practical shooting competitions in the Willamette...
  4. coastal steelheader

    And now we have lost another fishery! Don't read this thread if you have anger management problems.

    I lifted this from another forum so I just wanted to give credit to the guy who is posted it! Thank you WDFW X 1=0. Courtesy of Piscatorial Pursuits Tacoma Power has failed fishermen yet again!! | Northwest Fishing Board | Piscatorial Pursuits' Outdoor Forums - Alaska / Washington Salmon...
  5. jon321

    What's the best time of year for Sage rat hunting in Oregon?

    This would be my first rat hunt and was wondering what's the best location and month to go .Thanks
  6. Ironbar

    1st time buyer at Cheaper Than Dirt? Save $15 thru 1/31/17

    Never bought from them before, and they actually did have the cheapest price on an AR part I was looking for. Before I hit the "place order" button I decided to do a quick search online for any coupon codes. They have one valid through 1/31/17 for first-time buyers to their site. The coupon code...
  7. sigmadog

    Feeling better - time to go buy a gun!

    I got hit with the flu on 12/30/16. Felt pretty weak, and the next day the Missus and I spent 4 hours splitting firewood because we were almost out. I thought maybe I could sweat the cold away. Nope. Three weeks later, and this is the first week I've felt semi-normal. Today is the first day I...
  8. RicInOR

    Millennials - Try Shooting for First Time

    The Try Guys shoot Guns for the First Time Guy 1: I don’t like guns. at all. Guy 2: I don’t have a negative opinion about guns, I do have negative opinions about people. Guy 3: I’ve been invited to a gun range before with friends, and I said no, and I just sat in the car outside of the gun...
  9. 2A2Dend

    Build Thread  Upper/Lower Parts >Color >AR10

    Upper, lower and hand guard are black anodize. Now to get a list of parts wanted. I want to build in contrast, so I'm looking into what options are available. I like the color of nickel boron, but where to go to get the right parts? So, I'm looking for suggestions, please. The more I look into...
  10. SynapticSilence

    Time to Start Saving Up

    Just saw this on GunsAmerica. I may have to raid the kids' college funds on this one. Colt is Bringing Back The Cobra Double-Action Revolver for 2017
  11. NoLimePlease

    NFA Tracker - Current wait time estimator for NFA submissions

    I wanted to start a thread on NW Firearms that stays current within our group. Please post here your submission dates only after you have received your NFA item's stamp in the mail. Another good source for predictions can be found here in a different format: /NFA Transfer Time Tracking NFA...
Top Bottom