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Time is a peculiar phenomenon. We don't all seem to experience it in the same way—sometimes it rushes by, other times it drags, and as we grow older, it seems to pass even more rapidly. Numerous theories have been proposed to explain what time truly is and why it remains such an enigma, with some of them being quite mind-boggling.
10. St. Augustine's Concept of Mind-Time
The Christian philosopher St. Augustine shared some intriguing thoughts on the nature of time. He argued that time is not infinite. In his view, time was created by God, and as such, it’s impossible for something created by God to be infinite.
He argued that time exists solely in our minds, an odd conclusion that revolves around our personal perception of time. We often claim that an event lasted either a long or short duration, but as St. Augustine stated, there's no definitive way to measure this. Once something becomes part of the past, it no longer holds any qualities of existence, because it no longer exists. When we refer to time as being long or short, we’re simply recalling it that way. Since we only gauge time based on our recollections, it can only exist in our memories. The future, as it hasn't happened yet, has no measurable existence either. The only true presence is the present, a concept we’ll explore further shortly. Therefore, the only logical conclusion is that time exists solely in our minds.
9. The Nature of Time's Topology
What is the visual representation of time? Do you imagine it as an endless line stretching into the future? Or do you visualize it as a cycle, like the hands of a clock, endlessly rotating around, returning every day or year? There’s no correct interpretation, but there are some captivating theories surrounding it.
Aristotle believed time could not be visualized as a line, particularly not one with a clear start or end, despite the fact that there had to be a moment when time began. For time to begin, there must have been something before it to mark its origin. Similarly, for time to end, he suggested that there must be something following it to define the conclusion of time.
Another issue is the question of how many timelines there are—could there be a single timeline that all things follow together, or are there multiple timelines that occasionally intersect or run side by side? Is time just one line that has various branches? Or do individual moments exist independently of others in the time continuum? Many different opinions exist, but none provide clear answers.
8. The Elusive Present
The concept of the elusive present tackles the question of how long the present actually endures. The typical response, referring to it simply as the 'now,' lacks clarity. For example, when we’re having a conversation with someone, and we’re in the middle of speaking, we’ve already completed the start of the sentence and it's part of the past, yet the conversation continues in the present. So, how long does the present really last?
E.R. Clay and William James coined the term 'specious present' to describe this idea—the brief span of time that we experience as being in the present. They propose that it can last just a few seconds and is unlikely to extend beyond a minute, but it’s the duration that we are immediately and consciously aware of.
Within this framework, there remains a bit of flexibility for debate.
It could possibly be linked to the duration of a person’s short-term memory—the better it is, the longer the present appears. There’s also the notion that it’s merely about instantaneous perception, where once a moment has passed and you rely on your short-term memory, it no longer remains part of the present. Then there's the complication of the present and an extended present, which leads to the concept of the specious present. The present itself cannot have a measurable duration, because if it did, part of it would already be in the past and part would be in the future, creating a contradiction. Thus, the specious present seeks to describe the present as a time interval that lasts, yet remains distinct from the objective present.
7. Shorter Individuals Experience 'Now' Sooner
It sounds odd, but it holds up. This theory, proposed by neuroscientist David Eagleman, is known as temporal binding.
It’s based on the idea that we perceive the world in chunks of information that are gathered through our senses and processed by the brain. Various parts of the body, even if they gather information simultaneously, take slightly different times to transmit it to the brain. For example, imagine you're texting someone and, at the same moment, you bump your head on a telephone pole and stub your toe on the same pole. In theory, the information from your head injury reaches your brain faster than the sensation from your toe, but you’ll still feel both injuries at the same time. This happens because the brain organizes sensory data in a way that makes the most sense to us.
The delay in processing information is what makes shorter people more 'in-the-moment.' A shorter person actually experiences a more accurate version of time because the delay in transmitting information to the brain is less.
6. Time Appears to Be Slowing Down—and We Can Observe It
A long-standing mystery in physics has been the existence of dark energy. While we can observe its effects, we have no clear understanding of what it is. Professors from the University of the Basque Country in Bilbao and the University of Salamanca in Spain suggest that all our attempts to identify and define dark energy may have been futile because it may not exist at all. Instead, they propose that the effects we attribute to dark energy could actually be explained by the alternative idea that time is slowing down, ultimately heading toward a complete stop.
Consider the astronomical phenomenon of redshift. When we observe stars with a red light wavelength, it indicates they are accelerating. A group of Spanish professors now suggests that the universe’s acceleration is not due to dark energy, but rather an illusion caused by time slowing down. Light takes a considerable amount of time to reach us, and by the time it does, time has slowed down, making it appear as though everything is accelerating away. This time-slowing effect is infinitesimally small, but due to the immense distances in space, it becomes magnified, allowing us to observe it when we look at the stars.
They further claim that, over time, this slowing down will continue until it eventually halts entirely. The universe will freeze in its current state for all eternity—but there’s no need to worry, as this will take billions of years, by which time Earth will no longer exist.
5. Time Doesn’t Exist
There’s also the theory that time doesn’t exist at all, a view passionately defended by philosopher J.M.E. McTaggart in the early 1900s. McTaggart argued that we can understand time in two distinct ways. The first, known as A-Theory, suggests that time follows a specific order and progresses along a path; in this view, events can be organized as they unfold. This progression moves from the past, through the present, and into the future.
B-Theory, in contrast, argues that the passage of time—and time itself—is entirely an illusion, with no way to definitively assign events a specific order. This version of time seems to be supported by how we remember events, which often appear as isolated snapshots, not as part of an ongoing, flowing passage of time.
Taking both theories into consideration, it becomes clear that time cannot exist because, for time to exist, there must be continuous changes in events, the world, or circumstances. The B-Theory, by its very nature, does not reference the passage of time and involves no unfolding change. As a result, time, according to this theory, doesn’t exist.
However, even if the A-Theory were correct, it would still imply that time cannot exist. Consider a specific moment—like your 21st birthday. At one time, this moment was a point in the future, but eventually, it will be part of the past. Since a moment cannot be past, present, and future all at once, McTaggart argues that this theory is contradictory and, by extension, time itself is impossible.
4. Four-Dimensionalism and the Block Universe Theory
The theory of four-dimensionalism and the block universe theory are intertwined by the notion that time is a legitimate dimension. In four-dimensionalism, all objects exist within four dimensions rather than just three, and time, as the fourth dimension, can be understood in relation to the other three dimensions. The block universe theory visualizes the entire universe as a block composed of time slices. It has width, depth, and height, and for everything with measurable duration, there are layers of time that form its entire structure. Every person is a four-dimensional object that exists in these time layers—there are time layers for stages such as infancy, childhood, adolescence, and so forth. Time does not inherently function with past, present, and future, but each point within the block represents one of these based on its relation to other time points.
The block universe theory also suggests the possibility of infinite time, both in the past and the future, by stating that the dimensional block can extend infinitely in either direction. However, it does not allow for change in the future—since the events within the block of time already exist, the future is predetermined.
3. We’re Not Good At Telling Time
Time seems like it would be one of the simplest concepts to grasp when it comes to discussions of space, time, dimensions, and everything related to them. However, we’re not exactly great at accurately telling time, and our track record shows this clearly.
On one hand, we have sidereal time, which is measured by the position of the stars and Earth's rotation. However, this fluctuates quite a bit, so we also rely on the solar day. The solar day is determined by how long it takes for Earth to complete one rotation on its axis, though this too varies. To account for this, we use the average length of Earth's rotations over a solar year to establish our system of time.
However, in the early 20th century, scientists and astronomers observed that Earth's rotation was gradually slowing down. To address this, they introduced Ephemeris Time, but it was phased out in 1979.
Then came Terrestrial Dynamical Time, a more accurate time system based on International Atomic Time. This system was eventually discontinued in 1991 and was renamed Terrestrial Time.
Even though tracking time zones can be complicated, the positions of stars and other celestial bodies are still used in conjunction with Terrestrial Dynamical Time. Since Universal Time is the global standard, there had to be a method to convert between the two systems—that's where Delta T comes into play.
In the end, we don't really know what to make of time, despite living with it every day. The simplest questions about time are actually much more complex than they seem.
2. Khronos, Kronos, and Father Time
Before Greek philosophers delved into time’s mysteries, a mythological explanation existed, which featured the original Father Time.
At the dawn of everything, there were the primordial gods Khronos and Ananke. Khronos, the god of time, was envisioned as a creature that was part man, part lion, and part bull. Ananke, a serpent, coiled around the world’s egg, symbolizing eternity. Khronos also appears in Greco-Roman mythology, depicted standing within a zodiac wheel. Untethered by time, he could appear either as an old or young man—much like the modern depictions of Father Time or the baby of the New Year.
Khronos, often confused with Kronos, was the father of the titans. Kronos, also connected with time, was the titan who overthrew and castrated his father, only to later be slain by his son, Zeus. It was Khronos, however, who governed the flow of time through the changing seasons and years from the beginning. But the fate of men and women within that time belonged to another deity.
Time is often understood through the events that unfold within it. We experience growth and aging, and that human life cycle isn’t governed by time itself, but by the Moirai. Klotho weaves the thread of life, setting everyone’s journey in motion. Lakhesis measures the length of each thread, while Atropos ultimately severs it. The Moirai also predict future events, implying that our fates have already been determined. While the gods oversee the passage of time through seasons, the Moirai control what happens during those cycles, like Persephone’s return to her mother Demeter in the summer or her time with her husband during the winter.
1. The Oddball Effect
Sometimes, we hear of individuals in life-threatening or frightening situations who claim that time appears to slow down. This phenomenon often occurs during large-scale events or moments of complete surprise. It is so common that many have debated whether we’re actually experiencing time at a different pace to help us process the overwhelming amount of information we are exposed to.
Researchers began investigating what it would mean if time truly slowed down for us. We would be able to observe things more clearly and notice finer details as events rapidly unfold before us. The brain tends to merge stimuli into one experience when they occur less than 80 milliseconds apart. Therefore, if time were to slow, we would perceive these stimuli as distinct occurrences.
In the study, participants were shown a series of flashing numbers to find the point at which the brain could no longer separate the numbers, effectively losing track of time. After establishing their baseline performance, they were then asked to perform the same task while falling from a 46-meter (150 ft) tower. Later, they were asked to observe other people falling from the same height and estimate the duration of those falls compared to their own.
When participants were asked to judge the duration of their own fall, they estimated it to be about 36 percent longer than the falls they observed. Coupled with the finding that participants were no better at identifying the numbers when they were in a situation that should have made them experience slowed time, the results imply that it’s not time itself that slows down, but rather our memory of it. Although the ability to experience slowed time would have practical advantages, the current hypothesis suggests that it’s our recollection that makes frightening moments seem to stretch on forever.
