From scientific models to ancient myths, humanity has long sought to unravel the mystery of time.

What is Time?

THEORIES THROUGH HISTORY

The concept of time has been a subject of intense interest for thinkers throughout history.

Time as a Measure of Change:

Aristotle argued that time is not a thing in itself, but rather a way of measuring change and motion. 

Time, in essence, is a measure of change, and without change, there would be no way to perceive or measure the passage of time. 

We experience time through changes in our surroundings like:

• the sun rising and setting
• the seasons changing
• growing older

Time & Motion

Aristotle claimed that time is dependent on motion, meaning that time only exists in relation to and as a consequence of change occurring in the world. 

Time is “Now”

Aristotle considers the present moment, now, as a point of transition between the past and the future, a kind of “nothingness” that divides the two. 

Richard Muller’s Theory

Muller, a physicist at the University of California, Berkeley, posits that the expansion of the universe, starting with the Big Bang, constantly creates new space and, consequently, new time. 

“Now” as the Leading Edge

He argues that the “now” is the boundary, the shock front, or the leading edge of time, where new time is constantly being created. 

Implications for Time Travel

This theory has implications for our understanding of time travel, suggesting that the future is not predetermined, and that the “now” is the only reality that truly exists. 

Eternalism vs. Presentism

This concept contrasts with the block universe or eternalism, which suggests that all moments in time exist equally, and the presentism, which holds that only the present moment is real. 

Einstein’s Relativity

Muller’s theory builds on Einstein’s theory of general relativity, which views space and time as intertwined in a four-dimensional spacetime. 

“Now” as a Relative Concept

According to the American Museum of Natural History, time is relative, meaning the rate at which time passes depends on the observer’s frame of reference. 

Time as a Dimension

Some forms of eternalism view time as a dimension, similar to space, where different times are as real as different place.

Time & Soul

Aristotle and Time’s Dependence on the Soul: 

• Aristotle argued that time, as a concept, depends on the soul’s ability to perceive and count it. 
• He suggested that if there were no souls to “count” time, there might still be change, but not time itself. 
• This view implies that time is not just countable but also essentially counted, meaning it requires a conscious entity to exist as a measurable concept. 

Plato & the Soul’s Immortality

• Plato’s theory of the soul, influenced by Socrates, considered the soul (psyche) as the essence of a person, an incorporeal and eternal entity. 
• He believed the soul exists even after death and is able to think, and that as bodies die, the soul is continually reborn (metempsychosis) in subsequent bodies. 
• Plato divided the soul into three parts: logistikon (reason), thymoeides (spirit), and epithymetikon (appetite or desire). 

The World Soul (Anima Mundi)

• Some philosophical traditions, like Neo-Platonism, explored the concept of a world soul (anima mundi) or soul of the world,suggesting an intrinsic connection between all living beings and that the world is animated by a soul. 
• This concept posits that the world is animated by a soul much like the human body. 

Quantum Theory of Soul

This perspective suggests that the soul is not limited by space or time. 

Some theories, like the Quantum Theory of Soul, propose that the soul, as defined as information stored in the quantum field, can extend over space and time, potentially transcending the limitations of the physical body. 

Time as a Number

Aristotle describes time as a “number of motion with respect to the before and after,” suggesting that we can count or measure time by counting instances of change. 

Descartes on Time

Time as a Foundation for Diversity and Motion

Descartes’s mechanistic view of the world, where diversity and motion are fundamental, requires time for these phenomena to occur. 

Time as Proof for God’s Existence

Descartes uses the concept of “parts of time” in his Meditation III proof for God’s existence, emphasizing the role of time in our understanding of God’s attributes. 

Time as a “Mode of Thought”

In his Principles of Philosophy, Descartes also states that time is a mere attribute and “mode of thought”. 

Time & Duration

Descartes distinguishes between time as the measure of motion and duration as an attribute of things. 

Time & the Span of Life

Descartes sees no differentiation between the span of a life and the span of time itself. 

Descartes’s Method

Descartes’s method, which he later formulated in Discourse on Method (1637) and Rules for the Direction of the Mind (written by 1628 but not published until 1701), consists of four rules:

1. Accept nothing as true that is not self-evident
2. Divide problems into their simplest parts
3. Solve problems by proceeding from … 

Descartes’s dualism

Descartes introduced the concept of dualism, which argued that reality or existence is divided into two parts.

He argued that humanity could be divided into two parts as well: the mind and the body.

TIME AS MOMENTS

Time as a Series of Moments

This perspective suggests that time can be broken down into a sequence of unique, distinct moments, each representing a specific point in the timeline. 

Moment as a Point in Time

A moment, in this context, is an instantaneous point, a “now,” rather than a duration. 

Philosophical and Scientific Perspectives

Philosophers and scientists debate whether time is a real, objective thing or a human way of conceptualizing changing events. Some theories, like the

Static Theory of Time

suggest that time is like space, with no passage.

Dynamic Theory of Time

view time as a real phenomenon. 

Kairos vs Chronos

Kairos refers to an opportune or significant moment, while chronos refers to a specific amount of time, such as a day or an hour. 

Examples of “Moments in Time”

Think of memorable events, like a wedding, a birth, or a historical turning point. 

These are all “moments in time” that stand out as distinct points in the flow of time. 

Time as Absolute

Newtonian Time

According to its most famous proponent, Sir Isaac Newton, for example, absolute time (which is also sometimes known as “Newtonian time”) exists independently of any perceiver, progresses at a consistent pace throughout the universe, is measurable but imperceptible, and can only be truly understood mathematically.

For Newton, absolute time and space were independent and separate aspects of objective reality, and not dependent on physical events or on each other.

Time as a Product of the Mind

Whitehead | Heidegger—Time as the Form of Becoming

Whitehead and Heidegger described time as the process of things changing and becoming.

They believed that time is essential for things to happen and transform.

Theory of Relativity

SPACETIME

According to modern science, particularly the theories of relativity and quantum mechanics, time is considered a part of a larger concept called spacetime.

Spacetime includes all the events in the past, present, and future, and is interconnected with space.

Time as the Fourth Dimension

In physics, time is often considered the fourth dimension, alongside the three spatial dimensions, used to describe events in space.