Does time exist?

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origin said:
A light year is defined as the distance light travels in 1 year. This is approximately 300,000 km/sec x 60 sec/min x 60 min/hour x 24 hour/day x 365 days.
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t/dx of c would be 1 year, I do not see where there is any difference in saying it this way.

X would be a vector length.
 
amber said:
A light year (ly) is t/dx of the speed of light. It is a velocity.

t is time
d is distance
x is vector
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light year
noun
  1. ASTRONOMY
    a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).
    • informal
      a long distance or great amount.
      "the new range puts them light years ahead ofthe competition"
It's a distance. I know it's a distance but I was baiting Asexperia who put forward the weird idea

amber said:
However an Earth day is not the same as the constant day of space.
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Speed of light is 299 792 458 metres per second

Seconds in a year (Earth) 31557600 approx

Multiply 299 792 458 X 31557600
you get that 1 light year is approx

9,46,07,30,47,25,80,800 or
9.461x10^15 metres approx or
9.5 trillion kilometres approx

:)
 
origin said:
What does t/dx of c mean?
What is a vector length?
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t is time
d is distance
x is the vector

x is a vector that has a length or a distance if you like. A start point and an end point. I am surprised you do not know what a vector is. c is the speed of light approx 300,000,000 m/s , this is known as a light second.
 
amber said:
t is time
d is distance
x is the vector

x is a vector that has a length or a distance if you like. A start point and an end point. I am surprised you do not know what a vector is. c is the speed of light approx 300,000,000 m/s , this is known as a light second.
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I do know what a vector is, a vector is an object that has length and direction, I have no idea what you think a vector is.

Unfortunately, what you have presented is gibberish...

The speed of light is a light second?
Complete nonsense.

You seem to be saying that time divided by a distance divided by a distance (of some vector) of c?
That is complete nonsense.

Based on your past posting very soon you will proclaim that you are a sock puppet (imagine my surprise) and will run away (again).

It is funny how you come back here every so often to remind us you are still have no idea what you are talking about. We do not need to be reminded we already know....:)
 
origin said:
A light year is defined as the distance light travels in 1 year. This is approximately 300,000 km/sec x 60 sec/min x 60 min/hour x 24 hour/day x 365 days.
Click to expand...

but she is technically correct that the speed at which light travels is a velocity.
 
birch said:
but she is technically correct that the speed at which light travels is a velocity.
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The speed of light is indeed a velocity. But a light year is a distance not a velocity.

The distance to Alpha Centauri is ~4 light years. Amber is claiming a distance is a velocity. That is like saying the distance to Toledo is 45 mph.
 
origin said:
The speed of light is indeed a velocity. But a light year is a distance not a velocity.

The distance to Alpha Centauri is ~4 light years. Amber is claiming a distance is a velocity. That is like saying the distance to Toledo is 45 mph.
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I think you must be reading something completely different to that which I am writing.

A light year is based on velocity, the distance is set by the velocity . The constant distance of 1ly is because the speed of light is constant. A light year is a distance but it is also a velocity . If you do not travel at c it will take a lot more time than a 1ly to get there.
 
amber said:
I think you must be reading something completely different to that which I am writing.

A light year is based on velocity, the distance is set by the velocity . The constant distance of 1ly is because the speed of light is constant. A light year is a distance but it is also a velocity . If you do not travel at c it will take a lot more time than a 1ly to get there.
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A light year is a distance, not a time. However, if you're going 5,000 light years PER HOUR then you have a speed. You just quit before you were finished.
 
Asexperia said:
I have never said that the duration of the day is constant.
I have just said is natural.
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And I asked what use is a unit that is not constant?

The gazelle apparently runs slightly faster today than yesterday, because today is slightly shorter.
 
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amber said:
Humans invented the clock and any consequence action or theory about the clock can only be invented also.
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Never understood this rationalization.

If time is what clocks measure, what was it before clocks were invented? That was, after all, 99.999997% of the universe's life.
 
amber said:
A light year is a distance but it is also a velocity .
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False.

The Solar system has travelled a light year around the galaxy's centre, and it has taken considerably longer than a year to do it. Because (plainly) it is not moving at the speed of light.

ie. a light year is a fixed distance no matter how fast or slow you traverse it.


This isn't really a debate. A light year is a unit of distance. It is not a unit of time. Full stop.
 
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