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. DuneHopper

    Response time?? This is why we are armed.

    Where I live I am about maybe 2 miles from the Sheriff, Local PD, Ambulance, 2.5 miles from a Hospital. Now guns were not involved and is why its in OFF TOPIC a man that looked in sad shape came up our road, refused help from the neighbor but looked like he might drop right in the road. Mrs...
  2. PNWguy

    Boating time!

    Heading out on the lake tomorrow in the big boat.
  3. T

    Any tips for hunting coyotes or cougar in the Blue Mountians this time of year?

  4. RicInOR

    National  3D-printed guns are back, and this time they are unstoppable

  5. Mikej

    NO ONE, is happy all the time!

    I might just consider going into a Burger king again if these get get here! Burger King spoofs McDonald's with not-so-happy meals Meredith) -- Burger King is rolling out a new box meal called the "Real Meal." It's designed as a play on McDonald's happy meal, and a way to bring attention to...
  6. T

    Oregon  O-Live: Progun regulated opinion posted now, 4/10 At 8 am, time for counter attack

    Readers respond: Guns should be ‘well regulated’ Maybe provided some educated responses with science based references...
  7. E

    FIrst Time Turkey Hunting - Pointers?

    Hello fellows! Decided to try my hand at bagging a Tom this season. Signed up for the ODFW's turkey hunting clinic, this Saturday at EE Wilson. Had a few questions for those with more wisdom than myself. Best Camo patterns for Spring Vs. Fall? I'm going to do some scouting up at White...
  8. CountryGent

    ADT and Adrenalin dump ...

    Bear in mind, I live in the sticks, in a county with epidemic levels of poverty and drug use. Property crime and home invasions are constant. Where we are situated, unless it is a delivery, family, or invited individual, there is a huge chance it is a drug-addled jackass up to something. So...
  9. Mike97124

    Considering Beretta M9-22 .22lr - First Time Shooting

    I bought a Beretta M9-22 .22lr pistol a couple of months ago and this last Friday was the first time I got a chance to shoot it. My wife and I put about 150 rounds through it and didn't have any issues at all (not that I was expecting any) while we were shooting it. It shot well and since it...
  10. PNWguy

    Almost time for camping!!

    Last year this time I was already in the woods spending a couple of days in my crappy old pop-up camper, next to a stream, sitting by a fire, and drinking wine and enjoying the solitude... Chomping at the bit to go out for at least a night and clear my head like only a campfire and a...
  11. PNWguy

    Movie review time: How it Ends.

    How It Ends Movie Review & Film Summary (2018) | Roger Ebert "It’s an apocalyptic road trip movie between a man (Theo James) and his future father-in-law (Forest Whitaker) from Chicago to Seattle as the world is ending. It opens with relatively stale domestic drama as James’ Will flies to the...
  12. Sinistertitan

    When Was The Last Time.......

    That you bought some Unique at @2.70/lb? :) This tube isn't dated, but I have another one dated 1979, purchased from Rainier Sportsman in Enumclaw, WA. Both from my late grandfather. They look and smell fine. Loading some tonight to trial in the near future. My guess...... It'll shoot...
  13. cowboykid8

    Time Article on High School shooting teams

    Nice of a larger publication to attempt an unbiased article on trap shooting. Hopefully if you have a High School aged kid you are aware of a clay target team in the area. High School Shooting Teams Are Getting Wildly Popular — And the NRA Is Helping
  14. PNWguy

    Little bit of range time with the Extar...

    Finally had decent enough weather to get out to the range. Unfortunately, everything past 20yds was still buried in snow so I couldn't get to the further targets. But was able to put around 100rds through it using a couple of types of ammo and used three different types of magazines. First of...
  15. RicInOR

    OR - Daylight Savings Time - Standard Time - or Flippy Floppy Stays?

    Your representatives want to hear from you. There are bills in our Oregon legislature for these 2 options. Daylight or standard? Competing proposals end time change in Oregon in different ways SJM6 | Daylight Saving Time | United States Government
  16. arakboss

    Oregon  Leaders Wanted. It's Past Time To Take Serious Action.

    Edit as of March 9th: 6 House Districts down and 54 to go, I will update this thread as new sign ups occur. If you want to keep track of sign up progress check out this thread over on my original subreddit: Dedicated 2nd Amendment Group Leaders Wanted For 59 Oregon House Districts : orgunowners...
  17. Hushdc4

    Not new but first time posting.

    Hello! Well figure I'd come out of the shadows and say hi. Been a member since 2013 and just been creeping around reading posts and what not. I moved here from Hawaii in 08 and fell in love with the beautiful NW! Met my wife here 8 years ago and now have a 6 year old son, a 2 year old...
  18. bolus

    Oregon  time to start submitting bills to be sponsored

    Ever feel you are constantly on the defensive? Writing letters and emails about terrible bills you know will be ignored? Feel as if the legislature is flooded with anti-gun bills every year? Getting a bill submitted and sponsored by a representative is pretty easy and it is now time to start...
  19. Siglvr

    Oregon  Time to write our congressmen and senators etc etc

    Feel free to copy-paste this and send it to whomever. info on finding your representatives in links: Find Your Representative | House.gov Elected Officials | USAGov Sending anything is better than nothing. I just received a long email blurb from Congressman Blumaneur that the dems are...
Back Top