Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It 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 a fourth dimension, along with three spatial dimensions.

Time is one of the seven fundamental physical quantities in both the International System of Units (SI) and International System of Quantities. The SI base unit of time is the second, which is defined by measuring the electronic transition frequency of caesium atoms. General relativity is the primary framework for understanding how spacetime works. Through advances in both theoretical and experimental investigations of spacetime, it has been shown that time can be distorted and dilated, particularly at the edges of black holes.

Throughout history, time has been an important subject of study in religion, philosophy, and science. Temporal measurement has occupied scientists and technologists and was a prime motivation in navigation and astronomy. 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.

Source: Time (wikipedia.org)

Children links

Are You A Dream Of The Universe?

To get started planning a fulfilling career that does a lot of good, go to 80000hours.org/kurzgesagt for your free career guide. Sources & further reading: https://sites.google.com/view/sources-boltzmannbrain/startseite?authuser=2 Absolutely everything you think about yourself and the universe cou

What If The Speed of Light is NOT CONSTANT?

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime One of the most fundamental physics facts is that the speed of light in a vacuum is con

The benefits of 'deep time thinking'

In 1788, three men set off to search a stretch of coast in eastern Scotland, looking for a very special outcrop of rocks. It would reveal that Earth was far, far older than anybody thought.  Leading the party was James Hutton, one of the first geologists.

Lebanon wakes up in two rival time zones

People in Lebanon have woken up in two rival time zones, amid a row between political and religious authorities over when clocks should go forward.

The weird way language affects our sense of time and space

4th November 2022The languages we speak can have a surprising impact on the way we think about the world and even how we move through it.

The mind-bending physics of time | Sean Carroll

How the Big Bang gave us time, explained by theoretical physicist Sean Carroll. Subscribe to Big Think on YouTube ► https://www.youtube.com/channel/UCvQECJukTDE2i6aCoMnS-Vg?sub_confirmation=1 Up next, The Universe in 90 minutes: Time, free will, God, & more ► https://youtu.be/tM4sLmt1Ui8 In th

The people who live in multiple timelines

It wasn't until the third time I turned 40 that I began to get suspicious. The first time I'd been a bit preoccupied and unprepared for the existential baggage of a milestone birthday – particularly since I thought I was only 38. I turned 40 again a few months later.

Why does time go forwards, not backwards?

When Isaac Newton published his famous Principia in 1687, his three elegant laws of motion solved a lot of problems. Without them, we couldn't have landed people on the Moon 282 years later.

The super-clocks that define what time it is

I'm looking at a warning sign inside a laboratory in London. "Do not touch the maser," it reads. It's attached to a tall black box, on wheels, mounted in a steel protective case. Turns out it's a pretty important box, and the sign is there for a reason.

BREAKING: New Phase of Matter

What are time crystals? How do scientists make one on a quantum computer. Click https://helixsleep.com/physicsgirl for up to $200 off your Helix Sleep mattress plus two free pillows! Free shipping within the US! #helixsleep Support Physics Girl videos → https://www.patreon.com/physicsgirl Speci

Why progress bars can make you feel better

For a brief period of time in 2013, Samantha West was the hardest working employee of Premier Health Plans. She set up more deals than any other individual who worked at the insurance company.

European MPs vote to end summer time clock changes

The European Parliament has backed a proposal to stop the obligatory one-hour clock change which extends daylight hours in summer EU-wide. The proposal requires states to stop the twice-yearly clock change from 2021, and choose either permanent summer time or winter time.

Will US really stop changing its clocks twice a year?

The US Congress has the power of war and peace, to tax and spend billions of dollars and to regulate the lives of hundreds of millions of Americans. It even has control of time itself - or, at least, over the time that is displayed on the nation's clocks.

The 'time poverty' that robs parents of success

Time for yourself, time to spend with your kids or time to catch up on household tasks. Ask any parent what their greatest complaint is, and many will say some version of the same problem: there simply isn’t enough time for everything.

Robert E. Lee: Virginia workers open Civil War era time capsule

A conservation team in the US state of Virginia has opened a box containing Confederate war memorabilia believed to be more than 130 years old. It contained newspapers, books and ammunition dated to the US Civil War.

How Does Gravity Warp the Flow of Time?

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime There’s a deep connection between gravity and time - gravita

Google Earth time-lapse feature winds clock back 37 years

Google Earth has launched a time-lapse feature that lets users wind back the clock and see how the world has changed over several decades. The feature uses millions of satellite images from the past 37 years to let people scroll through time.

Ethiopia: The country where a year lasts 13 months

Ethiopians are marking the start of a new year, with feasting in many homes despite the difficulties caused by rising prices and the war and hunger crisis raging in the north. Find out more about Ethiopia's unique calendar and cultural heritage.

The Government and iPhones don't recognise it, but this stretch of desert has its own time zone

With urban legends like the Nullarbor Nymph, it's not too hard for tourists travelling the famous Australian east-west highway to get confused. But it's the three clocks at the Border Village roadhouse on the South and Western Australian borders that get the oddest looks.

The LONGEST time - Numberphile

A paper by Don Page claimed to use the longest finite time ever calculated by a physicist - it's the time it will take the Universe to reset itself!?! More links & stuff in full description below ↓↓↓ Video featuring Tony Padilla from the University of Nottingham. Read the paper at http://arx

How Does Gravity Affect Light?

https://www.patreon.com/pbsspacetime​ We know that gravity exerts its pull on light, and we have an explanation for why. Actually, we have multiple explanations that all predict the same thing. And at first glance, these explanations seem to describe completely different causes. So what is the t

Telling time by donkey balls? (joke)

A little laughter in this channel

Why Do You Remember The Past But Not The Future?

Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime The laws of physics don’t specify an arrow of time - they don’t distinguish the past from the future. The equations we use to describe how things evolve forward in time also perfectly describe thei

The psychology behind 'revenge bedtime procrastination'

Emma Rao spent almost three years on China’s notorious ‘996 schedule’: working from nine in the morning to nine in the evening, six days a week. Rao, who is originally from Nanjing, moved to financial hub Shanghai about five years ago to work for a multinational pharmaceutical company.

Time complexity

In computer science, the time complexity is the computational complexity that describes the amount of computer time it takes to run an algorithm.

John Cage musical work changes chord for first time in seven years

Fans have flocked to a church in Germany to hear a chord change in a musical composition that lasts for 639 years. It is the first change in the piece, As Slow As Possible, in seven years.

Why time seems to be going faster while we are in lockdown

As parts of the world begin to ease their lockdowns, some people are looking back and finding the time in isolation seems to have gone surprisingly fast.

Be more punctual, Ecuadorians are urged

Fire sirens will sound and church bells ring out at midday around Ecuador to mark the launch of the government's campaign to eradicate sloppy timekeeping - a vice which it says is hampering the country's economy.

Cells' internal clocks revealed

Scientists have found that each cell of the body has an internal "clock", which can be affected by various genes. Research in the Proceedings of the National Academy of Sciences shows that skin cells can be used to measure the speed of a person's body clock.

Cell discovery clues to body clock and beating jet lag

New discoveries into how the body clock works could provide clues to help combat jet lag, research suggests. The cells had been thought to be inactive during the day - but their research found the opposite was true.

Changes to the world's time scale debated

Time, as we know it, could soon be in for a radical change. This week, scientists at the Royal Society are discussing whether we need to come up with a new definition of the world's time scale: Coordinated Universal Time (UTC).

Circadian rhythm

A circadian rhythm (/sərˈkeɪdiən/), or circadian cycle, is a natural, internal process that regulates the sleep–wake cycle and repeats roughly every 24 hours.[1] It can refer to any process that originates within an organism (i.e.

Fish living in dark caves still feel the rhythm of life

Most animals have an internal body clock, or circadian rhythm, that lasts around 24 hours and is modified by the light-dark cycle of a day.

George Carlin- Does the time bother you? 1978 On location George Carlin Again.

Under the Fair use act of 1976 under section 107 this video is being used for educational purposes. TO make people THINK and question things in life. I make no money off this posting what so ever.

Lunar clock to be built for 2012

Scientists and artists plan to build a 40m-wide lunar clock by the River Thames by 2012. The aim is to create a new London landmark close to the proposed Olympic stadium as a monument to a more natural way of marking time.

Why having fun makes time speed

Scientists have come up with a theory for why time flies when you are having fun - and drags when you are bored. Scans have shown that patterns of activity in the brain change depending on how we focus on a task.

Imaginary time

Imaginary time is a mathematical representation of time which appears in some approaches to special relativity and quantum mechanics. It finds uses in connecting quantum mechanics with statistical mechanics and in certain cosmological theories.

Free Will and Quantum Clones: How Your Choices Today Affect the Universe at its Origin

The late philosopher Robert Nozick, talking about the deep question of why there is something rather than nothing, quipped: "Someone who proposes a non-strange answer shows he didn't understand the question.

Hints of 'time before Big Bang'

A team of physicists has claimed that our view of the early Universe may contain the signature of a time before the Big Bang. The discovery comes from studying the cosmic microwave background (CMB), light emitted when the Universe was just 400,000 years old.

The food that could last 2,000 years

On 8 September 1941, Nazi forces surrounded Leningrad from the west and south, and through Finland to the north. A thin strip of land across Lake Ladoga kept the residents in touch with the rest of Russia, but heavy shelling made it impossible to evacuate the population.