## Search found 1602 matches

- Mon Mar 24, 2014 12:36 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### Re: winds around the world - real time

http://earth.nullschool.net/ ....has been improved to include more than just wind Wind – Temp – RH – AD – WPD [ wind - temperature - relative humidity - wind power density ] | TPW – TCW – MSLP [ total precipitable water - total cloud water - mean sea level pressure ] as can be seen on 8 different pr...

- Tue Jan 14, 2014 2:25 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### Re: winds around the world - real time

the app has just added a couple of more options, including temperature. One can just click on any location and get the local temperature reading. http://earth.nullschool.net/

- Thu Dec 26, 2013 5:29 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### Re: winds around the world - real time

Cartography. That is difficult stuff. The wind map is beautiful. It shows the Jet Stream? Yes, from the menu...different heights above the Earth surface can be seen....1000 hPa is lowest and 10 hPa is highest...the jet stream is at 250 hPa. I am not able to use it. Yet. There are other options avai...

- Wed Dec 25, 2013 2:49 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### Re: winds around the world - real time

WB is an old projection I had on my wall at one time. Bucky had something to do with that map. right? No, this Waterman Butterfly projection is just of my own creation...based upon a cluster of spheres in an fcc format having a maximum distance from a central sphere of the square root of five. http...

- Tue Dec 24, 2013 2:24 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### Re: winds around the world - real time

1 Click on EARTH to get menu

2 Use scroll wheel to make map larger or smaller

3 Click on EARTH again to get menu off of display screen

2 Use scroll wheel to make map larger or smaller

3 Click on EARTH again to get menu off of display screen

- Thu Dec 19, 2013 4:10 pm UTC
- Forum: General
- Topic: winds around the world - real time
- Replies:
**16** - Views:
**14391**

### winds around the world - real time

Cameron Beccario has just made this new app that shows winds from all over the globe. There are several different levels that can be seen as well as several different projections. Among these are the Waterman Butterfly labelled as WB. http://earth.nullschool.net/ From there click on "earth"...

- Tue Nov 12, 2013 7:44 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

I only got into Physics following the path of the ccp, as I continue to do. I kept getting confronted with "you cannot say that because of relativity", in numerous meetings at McGill. Finally I thought, well I have no other choice do I, let's check it out. ["ccp" being an abbrev...

- Tue Nov 12, 2013 5:38 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

I will respond to this; Schrollini's misunderstanding... [ I fear this is an impossible task -- Steve has so much ego invested in his sphere packing model, which (in his mind) conflicts with relativity, Never said that, never will. Sphere packing has nothing to do Relativity. You have wildly misrepr...

- Tue Nov 12, 2013 4:48 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

All, If this does not become too tedious, I will PM responses directly....from some of your posts that are made to the thread. However, I do not desire to have those PM messages posted to the thread. If that happens, then I will simply stop writing any Private Message's. btw, the two threads combin...

- Tue Nov 12, 2013 4:23 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

All, If this does not become too tedious, I will PM responses directly....from some of your posts that are made to the thread. However, I do not desire to have those PM messages posted to the thread. If that happens, then I will simply stop writing any Private Message's. btw, the two threads combine...

- Tue Nov 12, 2013 1:54 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

cyantoshi, Yes, I agree with your statement about our discussion being over. Jude, I am the one stating that a coordinate system contains points. Relativity says that points only exist in the manifold. So, your highlighting that the term abscissa refers to some point that represents the distance fro...

- Mon Nov 11, 2013 10:57 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

That's not how anyone else on the planet is using it though. If you use it in the manner I've described, you can answer a useful question. (If I know the coordinates of a point in one coordinate system [note, the coordinates are what are in the coordinate system, not the point itself] and the relat...

- Mon Nov 11, 2013 10:30 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

x = the abscissa of S and x' = the abscissa of S'

- Mon Nov 11, 2013 10:04 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

No it doesn't because it's conditional on t=0 and thus doesn't hold if t changes? Or rather it's always x'=x-vt. So the question remains. Obvious too, is that when t = 0, then x = x' for x' = x-vt. All that I am saying is that x = x' when t > 0, and that x' = x-vt is not true when t > 0. This reall...

- Mon Nov 11, 2013 9:43 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

No it doesn't because it's conditional on t=0 and thus doesn't hold if t changes? Or rather it's always x'=x-vt. So the question remains. Obvious too, is that when t = 0, then x = x' for x' = x-vt. All that I am saying is that x = x' when t > 0, and that x' = x-vt is not true when t > 0. This reall...

- Mon Nov 11, 2013 9:13 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

You are trying to make x and x' refer to distances. What distance exactly? Please answer this question for cyanyoshi, so they can respond. Given S(x,y,z) x is the abscissa where abscissa is the the value of the coordinate. x is the distance from S(0,0,0) to S (x,0,0) Groovy. Now why should the dist...

- Mon Nov 11, 2013 8:27 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

You are trying to make x and x' refer to distances. What distance exactly? Please answer this question for cyanyoshi, so they can respond. Given S(x,y,z) x is the abscissa where abscissa is the the value of the coordinate. x is the distance from S(0,0,0) to S (x,0,0) Here are a dozen ways of saying...

- Mon Nov 11, 2013 5:10 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

cyanyoshi, [ others are asked to please hold off comments until I get a few responses from cyanyoshi first, thanks ] I will skip to the bottom line... Given S(x,y,z)...x = distance from S(0,0,0) to S(x,0,0) and Given S'(x',y',z')...x' = distance from S'(0,0,0) to S'(x',0,0) and Given S and S' coinci...

- Mon Nov 11, 2013 12:15 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

cyanyoshi, In an attempt for you and I to have a valid discussion, I am initially trying to establish a working scenario for the terms "point" and "coordinate system" that we can mutually agree upon. adding these two statements to the three statements previous posted... 4 Given a...

- Mon Nov 11, 2013 1:57 am UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

I won't interfere with that, but I would like an answer to why you felt bringing age up was suddenly, somehow, appropriate. I don't really expect a response to my assertion that it was intellectually dishonest and dangerously backwards, but I do think you ought to reconsider your intent with respec...

- Mon Nov 11, 2013 12:59 am UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

The big thing about coordinate transformations is that there is only one dot and it doesn't move. What "moves" is the ruler that is measuring where the dot is. If you are talking about something else, then you are not referring to a coordinate transformation. I wish to have an exclusive d...

- Sun Nov 10, 2013 12:41 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Steve, when you say x=x', you must also staple your two rulers together at that point.... x in (ruler) S gets stapled to x' in (ruler) S'. This ensures that x will always equal x'. Now move the rulers around. Jose The Galilean example however would do this... 1 commence with the two rulers imagined...

- Sat Nov 09, 2013 2:53 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

The origins (of the 3D Cartesian systems at time t≠0) are in different places, It is part of the given for the Galilean, at t = 0, S and S' are coincident. What's your point? I say that at t≠0 the two are in different places, and so you're measuring two different distances, and your response is to ...

- Sat Nov 09, 2013 1:59 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

The origins (of the 3D Cartesian systems at time t≠0) are in different places, It is part of the given for the Galilean, at t = 0, S and S' are coincident. That means that S and S' are in the same exact place at t = 0. http://en.wikipedia.org/wiki/Galilean_transformation The notation below describe...

- Sat Nov 09, 2013 1:37 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

What is the point of distance to origin? Because in the given Galilean equation x' = x at t = 0, x was defined as distance and x' was defined as distance. Regardless of what one may think the manifold point equation might be, the fact is that these definitions for x and x' do not chance because vt ...

- Sat Nov 09, 2013 1:10 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

x' is defined as the distance x' from S'(0,0,0) to S'(x',0,0) Oops...I made a typo, obviously, as I have said/typed this definition properly like perhaps a 100 times before, so I corrected the above statement. Now, I wish to focus upon the assertion that although the Galilean equation is always writ...

- Fri Nov 08, 2013 11:28 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Round and round. x is defined as distance...you all insist upon comparing points. You focus exclusively upon the end point of the vector distance. You say the red dots do move but are uninteresting. I tire of this arguing technique of avoidance by saying the dots are uninteresting as your manner of...

- Fri Nov 08, 2013 10:53 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Round and round. x is defined as distance...you all insist upon comparing points. You focus exclusively upon the end point of the vector distance. You say the red dots do move but are uninteresting. I tire of this arguing technique of avoidance by saying the dots are uninteresting as your manner of ...

- Fri Nov 08, 2013 10:13 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

ST, I have been told over and over and had forced upon me many times..."points do not move as the coordinate system moves". That is, only the coordinates move but NOT the red dots/points. That is the problem. The red dots/points I say do move, and up to now, you/the Galilean declares that ...

- Fri Nov 08, 2013 8:37 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Can you explain it like you'd explain it to a child? (Aka, someone under the age of 12) That might be interesting to try. Imagine you have two 12 inch rulers, but imagine that both rulers share the exact same locations in space. Now imagine we place a red dot at the same number of inches on each of...

- Fri Nov 08, 2013 8:01 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Can you explain it like you'd explain it to a child? (Aka, someone under the age of 12) That might be interesting to try. Imagine you have two 12 inch rulers, but imagine that both rulers share the exact same locations in space. Now imagine we place a red dot at the same number of inches on each of...

- Fri Nov 08, 2013 3:32 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Mathematically, GIVEN Cartesian coordinate system S(x,y,z)... x is mathematically defined ( no choice ) as the abscissa of S. That means ( no choice ) that x is defined as the distance from S(0,0,0) to S(x,0,0). This is not just my way of looking at it, but the way that all mathematics defines x whe...

- Fri Nov 08, 2013 2:08 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Unless you're saying that "a distance of 2 on this arbitrary measurement scale equals a distance of 2 on this other arbitrary measuring scale" to which the only answer is "..so?" or even the more abrasive "No shit?" Based on my experience on this carosel, that's exactl...

- Thu Nov 07, 2013 4:44 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

then if we allow either system to move or even to also manifest rotation(s) from that coincidence, for an example of this, see the following depiction. Wasn't it established that systems cannot move or rotate or anything of the sort? Or am I mis-remembering? Coordinate systems can be mathematically...

- Thu Nov 07, 2013 3:19 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

I thought I would give this line of logic one more chance. Given coincident Cartesian systems S(x,y,z) = S'(x',y',z') where x = x', where x is defined as the VECTOR DISTANCE from S(0,0,0) to S(x,0,0) and where x' is defined as the VECTOR DISTANCE from S'(0,0,0) to S'(x',0,0)... then if we allow eith...

### Re: Age

I was quite surprised to see the readership broken down by age. I also was surprised that 41+ only had 2 percent. I am 65 and suspect that I might be the only poster with 100+ posts and also in their sixties. I wonder if an older person has ever posted to xkcd if even just a total of 2 or more posts...

- Sat Oct 12, 2013 11:47 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

http://www.popsci.com/science/article/2013-08/worlds-most-precise-clock clocks measure rotation rates of some condition it is the rotation rate that changes and that does not mean that time changes this concept seems to be beyond the level of current understanding except for me alone I accept that ...

- Sat Oct 12, 2013 4:52 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

Indeed, that IS exactly the problem. In Relativity, they do NOT possess enough info to facilitate the determination of THE UNIQUE transmission sequence of multiple events! However, using a universal coordinate system with a universal time, then THE UNIQUE transmission sequence of multiple events is...

- Sat Oct 12, 2013 3:46 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

given the equation 23x + 14y = 117...what does y equal? answer; there is not enough information to solve this equation as we have two variables with just one equation. What if we are also told that 103x +5y = -88.54 also applies to the initial equation above7? Now we can can determine what both x an...

- Fri Oct 11, 2013 5:04 pm UTC
- Forum: General
- Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
- Replies:
**908** - Views:
**158436**

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

xkcd - a health note... It did not go well at the hospital yesterday and was told I have had a 5 percent of getting a blood clot. So, I must take added injections for the next 4-5 days plus my normal 10 pills a day. One injection is over 28 dollars...but thankfully I am in Canada and over 65 years y...