[homebrewer (OP)]

The Universe exists in three dimensions, but what about time.

In my opinion even time has three facets:

The past... which has already elapsed
The future... that has not already arrived
The present... the moment in time we can enjoy now

[puppypower]

Time exists in 3-D but science treat it as 1-D, time line, to simplify the analysis.

0-D time is a point in time. We can record this with a camera still shot. At 0-D time, time has stopped.

1-D time is a time line. A time line has a past, present and future.

2-D time is a time plane. The best example of 2-D time is acceleration, which is d/t/t. It is one part distance and two pats time. All the forces of nature make use of 2-D time, in terms of their attractive and repulsive acceleration affects.

3-D time is a cube. The best example of this is the accelerated expansion of the universe. The Gravitational force causes an acceleration of matter using 2-D time, while dark energy creates an acceleration of this acceleration; in the negative sense. This affect can be expressed as d/t/t/t.

In terms of space-time, it really should be written as (x,y,z, t1, t2,t3). This 6-D model gives us all the space and time related data for any given point in space-time. Currently, we do each dimension of time as separated things, to make it easier. The problem this creates is during reassembly, into a time line, the 2-D and 3-D aspects of time can't be fully defined by the line, without overlapping beyond the time line. The result is the perception of random.

If we use the time cube or 3-D time as the variable for integrating time, everything will fit.

[GoC]

Only the present exists as a flow of motion. We perceive time as motion by our synapsis firing. But that is motion in itself. Without c energy there would be no motion and lack of motion is lack of time. Black Holes are void of time because there is no motion of the electron. While mass gives us our three dimensions it is c that causes motion of electrons. We would not have life without motion. The mathematics of time is relative density of energy c. All electrons are moving at a constant speed but not at a constant distance. This is handled by relativity.

Past and future are just man made concepts to distinguish order of events. Happy new year.

[Bored chemist]

The Universe exists in three dimensions, but what about time.

In my opinion even time has three facets:

The past... which has already elapsed
The future... that has not already arrived
The present... the moment in time we can enjoy now

As I walk down the road I can see three facets,
In front of me
Behind me and
Where I am.
But the other dimensions are above /below and Left/Right

[guest39538]

The past... which has already elapsed
The future... t

past , future and present position is not time, neither is it interwoven with space to make a 4 dimensional manifold.   

Time is a quantifiable measurement directly proportional to ageing.

[jeffreyH]

The Universe exists in three dimensions, but what about time.

In my opinion even time has three facets:

The past... which has already elapsed
The future... that has not already arrived
The present... the moment in time we can enjoy now

As I walk down the road I can see three facets,
In front of me
Behind me and
Where I am.
But the other dimensions are above /below and Left/Right

You must have eyes in the back of your head! Unless sometimes you walk down the road backwards. To be serious though a very good point and very succinctly put. I had thought of explaining dimensions. Maybe with respect to variables and degrees of freedom but why bother?

[evan_au]

In my opinion even time has three facets:The past... The future... The present...

These three facets can be described as a single number on a single dimension.
- Perhaps what you mean a direction, rather than a dimension?
- Just like our cars have a rear-vision mirror?

Some serious mathematicians and physicists have played with the concept of multiple time dimensions, some suggesting that the early universe may have had more than one time dimension, which are now "rolled up" and invisible to us.

While it is possible to describe more than one time dimension mathematically, we simply cannot imagine what such a universe would appear like, with our very fixed concept of cause & effect on a single time dimension.

A mathematician expresses this frustration here: http://www.askamathematician.com/2012/06/q-what-would-the-universe-be-like-with-additional-temporal-dimensions/

Some of the attempts to mathematically model more than one time dimension are described here: https://en.wikipedia.org/wiki/Multiple_time_dimensions