Time

pete_c

Guru
Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.  Time is often referred to as the fourth dimension, along with the spatial dimensions.

Time has long been a major subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars. Nevertheless, diverse fields such as business, industry, sports, the sciences, and the performing arts all incorporate some notion of time into their respective measuring systems.  Some simple definitions of time include "time is what clocks measure", which is a problematically vague and self-referential definition that utilizes the device used to measure the subject as the definition of the subject, and "time is what keeps everything from happening at once", which is without substantive meaning in the absence of the definition of simultaneity in the context of the limitations of human sensation, observation of events, and the perception of such events.
 
Daylight saving time

Daylight saving time (DST) or summer time (see "Terminology") is the practice of advancing clocks during summer months by one hour so that light extends into the evening hours—sacrificing normal sunrise times. Typically, users of DST adjust clocks forward one hour near the start of spring and adjust them backward in the autumn to "normal" or regular time.

New Zealander George Vernon Hudson proposed the modern idea of daylight saving in 1895. Germany and Austria-Hungary organized the first implementation, starting on 30 April 1916. Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.

The practice has received both advocacy and criticism. Putting clocks forward benefits retailing, sports, and other activities that exploit sunlight after working hours, but can cause problems for evening entertainment and for other activities tied to the sun (such as farming) or to darkness (such as fireworks shows). Although some early proponents of DST aimed to reduce evening use of incandescent lighting (formerly a primary use of electricity), modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory.

DST clock shifts sometimes complicate timekeeping and can disrupt meetings, travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns.  Software can often adjust computer clocks automatically, but this can be limited and error-prone, particularly when various jurisdictions change the dates and timings of DST changes.
 
Daylight Saving Time Begins Sunday, March 8, 2015
 
Using the following statement for my IP cameras:  CST+6CDT+5,M3.2.0,M11.1.0
 
pete_c said:
Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.  Time is often referred to as the fourth dimension, along with the spatial dimensions.

Time has long been a major subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars. Nevertheless, diverse fields such as business, industry, sports, the sciences, and the performing arts all incorporate some notion of time into their respective measuring systems.  Some simple definitions of time include "time is what clocks measure", which is a problematically vague and self-referential definition that utilizes the device used to measure the subject as the definition of the subject, and "time is what keeps everything from happening at once", which is without substantive meaning in the absence of the definition of simultaneity in the context of the limitations of human sensation, observation of events, and the perception of such events.
 
Daylight saving time

Daylight saving time (DST) or summer time (see "Terminology") is the practice of advancing clocks during summer months by one hour so that light extends into the evening hours—sacrificing normal sunrise times. Typically, users of DST adjust clocks forward one hour near the start of spring and adjust them backward in the autumn to "normal" or regular time.

New Zealander George Vernon Hudson proposed the modern idea of daylight saving in 1895. Germany and Austria-Hungary organized the first implementation, starting on 30 April 1916. Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.

The practice has received both advocacy and criticism. Putting clocks forward benefits retailing, sports, and other activities that exploit sunlight after working hours, but can cause problems for evening entertainment and for other activities tied to the sun (such as farming) or to darkness (such as fireworks shows). Although some early proponents of DST aimed to reduce evening use of incandescent lighting (formerly a primary use of electricity), modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory.

DST clock shifts sometimes complicate timekeeping and can disrupt meetings, travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns.  Software can often adjust computer clocks automatically, but this can be limited and error-prone, particularly when various jurisdictions change the dates and timings of DST changes.
 
Daylight Saving Time Begins Sunday, March 8, 2015
 
Using the following statement for my IP cameras:  CST+6CDT+5,M3.2.0,M11.1.0
 
Pete
 
Are you getting philosophical in your old age? time will do that to a person.
 
 
@Pete:
Speaking of time and the passage thereof, if you haven't yet seen the movie Interstellar, you'd probably like it.
 
I did and liked the movie and time in general.
 
DST clock shifts sometimes complicate timekeeping and can disrupt meetings, travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns.  Software can often adjust computer clocks automatically, but this can be limited and error-prone, particularly when various jurisdictions change the dates and timings of DST changes.
 
I noticed that DST might be going away.  Thinking some 11 states are pushing to remove it and not utilize DST.
 
pete_c said:
I did and liked the movie and time in general.
 
I also like space. I was just wondering why we measure everything in time in the first place. Why not distance:)
 
I'm 61 years old and our earth travels approx 584,000,000 miles in each trip around the sun which means that I have ~ 584,000,000 x 61 or 35,624,000,000 miles on me give or take a few.
 
Mike.
 
mikefamig said:
I also like space. I was just wondering why we measure everything in time in the first place. Why not distance:)
 
I'm 61 years old and our earth travels approx 584,000,000 miles in each trip around the sun which means that I have ~ 584,000,000 x 61 or 35,624,000,000 miles on me give or take a few.
 
Mike.
 
I thought everything was measured in $$$ ;)
 
Everything looks better on paper because you can read it and see it.
 
In the 1950's a bored NATO pilot in Indochina wrote a paper about what it is a person would see when they looked at an object that could travel at the speed of light....well he only guessed using proven theorems.  Guessing he was mostly interested in the physics of what exactly flight is.  Geez whatever made him think about this anyways; must have been really bored at the time.
 
The document did make for some interesting reading about light in general.
 
pete_c said:
Everything looks better on paper because you can read it and see it.
 
In the 1950's a bored NATO pilot in Indochina wrote a paper about what it is a person would see when they looked at an object that could travel at the speed of light....well he only guessed using proven theorems.  Guessing he was mostly interested in the physics of what exactly flight is.  Geez whatever made him think about this anyways; must have been really bored at the time.
 
The document did make for some interesting reading.
 
I'll bet that was very interesting reading. I would think that if you travel faster than the speed of light then you would be seeing things as they existed at a point in time that is different than they would appear if you stood still and observed them from a great distance.  Huh? Thinking about the relationship between time and space hurts my head. I have read that when we observe the stars through the Hubbel telescope that we are seeing them as they appeared a very long time ago because of the time that their reflection takes to travel to us through space. That would mean that if we could travel towards them at a rate much greater than the speed of light then we could watch them age very quickly?
 
 I can kind of understand how we see things in the past and how far in the past depends on the distance between the object we are viewing and our eye. This is because it takes time for the light reflecting off the object to travel from that object to our eye. But I have also read that objects grow larger as they accelerate faster than the speed of light. What is that all about?
 
I'd love to have a shot at reading that paper but I'll bet it's not easy reading.
 
Mike.
 
I have to find it as its on paper and it may be on an old computer that I kept from the 80's.  The paper only dealt with the physics of light. 
 
I was playing with lasers at the time and someone gave it to me to read. (hobby thing).
 
mikefamig said:
I'll bet that was very interesting reading. I would think that if you travel faster than the speed of light then you would be seeing things as they existed at a point in time that is different than they would appear if you stood still and observed them from a great distance.  Huh? Thinking about the relationship between time and space hurts my head.
 
 
If you are interested in this sort of stuff, read A Brief History of Time, by Stephen Hawking.  It's very understandable, even if you aren't an astrophysicist.
 
Guessing that the guy who wrote the paper was a physicist first and a pilot second and very bored at the time.
 
Yeah here too relating to lasers and stuff played a bit when taking physics.  Later used them for "work".  They were too big to take home and play.  Later a friend started to give me (lend) a variety of lasers to play with. (lasers mounted on rails)  "try this one or that one".  I was bored a bit at the time. Played in the garage mostly.    It was low though WAF at the time as the power supplies were large and would dim the lights in the house at night.
 
Here is a never ending Homeseer thread I started relating to Stephen Hawking a bit ago. He is not done yet.
 
Back
Top