Gravity induced time dilation

"Clive George" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I think modern physics has a fair bit to say about this effect, and believe
it can offer an explanation for some common experiences of bike riders.

Ah, hill-effect theory.

Jc.

Josey said the following on 15/03/2007 07:32:

Quoted message said:

Ah, hill-effect theory.

Sounds more like a ready-made reason for Alan's world-record-beating
speed/endurance efforts :-)

--
Paul Boyd
http://www.paul-boyd.co.uk/

Paul Boyd said:

Josey said the following on 15/03/2007 07:32:

Quoted message said:

Ah, hill-effect theory.

Sounds more like a ready-made reason for Alan's world-record-beating
speed/endurance efforts :-)

Though I've had a similar effect in the very flat, no brown lines, Carse
of Gowrie. Oddly, the Met Office had lots of /black/ lines on their
maps that same day though, though nothing much to do with gravity.

So perhaps it's just a lines on maps problem?

(Alan's could have been a not being able to work a clock problem?)

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

In article <[email hidden]>, Clive
George
[email hidden] says...

Quoted message said:

I think modern physics has a fair bit to say about this effect, and believe
it can offer an explanation for some common experiences of bike riders.

Viz : presumably most people have noticed that some sections of road/track
take an absolute age to get from one point to another, yet the reverse
journey appears to take no time at all.

I believe this can be explained using modern relativistic physics - what's
happening is the gravity field is making time perturb as you travel along
the road. This is a field effect, so the direction of crossing the field
lines is important, and explains why the phenomenon reverses when you cross
the field lines the other way.

The more field lines you cross, the greater the time-dilation effect. The OS
have carefully provided an approximation of these field lines, which can be
convenient - the brown lines which claim to be contours can also be used to
estimate the effect on our mental clocks.

Apparently there's a similar but variable effect that is charted by the
Met Office.

Josey wrote on 15/03/2007 07:32 +0100:

Quoted message said:

"Clive George" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I think modern physics has a fair bit to say about this effect, and believe
it can offer an explanation for some common experiences of bike riders.

Ah, hill-effect theory.

I find the problem is easily solved if you do a (x,y,z)->(x,y,-z)
coordinate tranformation at the minimum point and then reverse it when
you reach the maximum point. From thereon its downhill all the way ;-)

--
Tony

"...has many omissions and contains much that is apocryphal, or at least
wildly inaccurate..."
Douglas Adams; The Hitchhiker's Guide to the Galaxy

On Thu, 15 Mar 2007 11:37:50 +0000

Tony Raven said:

Josey wrote on 15/03/2007 07:32 +0100:

Quoted message said:

"Clive George" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I think modern physics has a fair bit to say about this effect,
and believe it can offer an explanation for some common
experiences of bike riders.

Ah, hill-effect theory.

I find the problem is easily solved if you do a (x,y,z)->(x,y,-z)
coordinate tranformation at the minimum point and then reverse it
when you reach the maximum point. From thereon its downhill all the
way ;-)

My mother once told me it was her childhood ambition to implement
this when she grew up. But girls of her generation didn't
usually get firsts in engineering or physics, so it wasn't
until later in life that she acquired the relevant background.
And by then, she'd given up cycling (for no good reason).

--
not me guv

In article <[email hidden]>,
[email hidden] says...

Quoted message said:

In article <[email hidden]>, Clive
George
[email hidden] says...

Quoted message said:

I think modern physics has a fair bit to say about this effect, and believe
it can offer an explanation for some common experiences of bike riders.

Viz : presumably most people have noticed that some sections of road/track
take an absolute age to get from one point to another, yet the reverse
journey appears to take no time at all.

I believe this can be explained using modern relativistic physics - what's
happening is the gravity field is making time perturb as you travel along
the road. This is a field effect, so the direction of crossing the field
lines is important, and explains why the phenomenon reverses when you cross
the field lines the other way.

The more field lines you cross, the greater the time-dilation effect. The OS
have carefully provided an approximation of these field lines, which can be
convenient - the brown lines which claim to be contours can also be used to
estimate the effect on our mental clocks.

It seems the field lines of greatest effect are conveniently marked on
OS maps with a black chevron. Round these parts we have a peculiar
anomaly (see http://www.streetmap.co.uk/newmap.srf?x=449180&y=257625&z=3
&sv=449180,257625&st=4&ar=Y&mapp=newmap.srf&searchp=newsearch.srf&dn=
827, http://tinyurl.com/2fp8as) where the chevrons point both ways on
the field line, which must allow time to dilate in an ever-increasing
(or decreasing, depending on whether you cycle the anomaly clockwise or
anti-clockwise) circle. This could of course explain why some of locals
still appear to be in the 18th century 😉

--
Colin

Coincidence is the alibi of the Gods

(remove FOOT to reply)

Colin wrote on 15/03/2007 23:02 +0100:

Quoted message said:

It seems the field lines of greatest effect are conveniently marked
on OS maps with a black chevron. Round these parts we have a peculiar
anomaly (see
http://www.streetmap.co.uk/newmap.srf?x=449180&y=257625&z=3
&sv=449180,257625&st=4&ar=Y&mapp=newmap.srf&searchp=newsearch.srf&dn=
827, http://tinyurl.com/2fp8as) where the chevrons point both ways
on the field line, which must allow time to dilate in an
ever-increasing (or decreasing, depending on whether you cycle the
anomaly clockwise or anti-clockwise) circle. This could of course
explain why some of locals still appear to be in the 18th century 😉

There is a definite spatial anomaly in Bristol here:
http://www.streetmap.co.uk/streetmap.dll?G2M?X=358048&Y=173170&A=Y&Z=1

You have the options of getting to Tyndall Avenue from the top of Park
Street by either cycling up the long steep hill of University Road or
you can cycle along Queen's Road, Tyndall's Park Road and Woodland which
is flat all the way.

--
Tony

"...has many omissions and contains much that is apocryphal, or at least
wildly inaccurate..."
Douglas Adams; The Hitchhiker's Guide to the Galaxy

Tony Raven said:

There is a definite spatial anomaly in Bristol here:
http://www.streetmap.co.uk/streetmap.dll?G2M?X=358048&Y=173170&A=Y&Z=1

This whole area of Bristol is one giant big spatial anomaly.

Quoted message said:

You have the options of getting to Tyndall Avenue from the top of Park
Street by either cycling up the long steep hill of University Road or
you can cycle along Queen's Road, Tyndall's Park Road and Woodland which
is flat all the way.

Tyndall's Park Road and Woodland Road both have gradients and someone
from Holland would probably deem steep. It is just have tackling Park
street or similar, they seem flat.

It is a pain, as I always hit a steep hill when I am nearly home, yet
always hit a steep hill just after I leave for work. (In about 45 min
from now).

Martin.

Martin Dann said:

Tony Raven said:

There is a definite spatial anomaly in Bristol here:
http://www.streetmap.co.uk/streetmap.dll?G2M?X=358048&Y=173170&A=Y&Z=1

This whole area of Bristol is one giant big spatial anomaly.

Quoted message said:

You have the options of getting to Tyndall Avenue from the top of Park
Street by either cycling up the long steep hill of University Road or
you can cycle along Queen's Road, Tyndall's Park Road and Woodland which
is flat all the way.

Tyndall's Park Road and Woodland Road both have gradients and someone
from Holland would probably deem steep. It is just have tackling Park
street or similar, they seem flat.

It is a pain, as I always hit a steep hill when I am nearly home, yet
always hit a steep hill just after I leave for work. (In about 45 min
from now).

Martin.

Hmm - On a tour of Holland, after I'd been using a bike for about 4 months
after a 40-year break, it seemed to be ever-so-slightly uphill (the horizon
seemed just that little bit higher than it should have been) from Stavoren
to Emmen via Groningen. As we continued further, still climbing
imperceptibly, in the general direction of That Vervloekt Place We Couldn't
Avoid, we came to the top of a bloody great hill that was about a couple of
miles and descended what seemed like several thousands of feet (couldn't
have been, of course, 'cos Everybody Knows that Holland is as flat as a
pancake).

Suffice to say that we were very glad indeed that we chose our circuit that
way round 🙂

Footnote: All the components of my £99 SHS were thoroughly worn out after
that tour; there were graunching noises from all the bearings, which, on
inspection, proved to be hemispherical lumps of some oddly-coloured
material which had ground away the races on both wheels, the pedals and the
BB too. Nice frame, though, and a good fit, so I've spent a small fortune
since making everything very nice 🙂

Why is it that it's much cheaper to buy stuff from Germany than from the UK?

--
Regards
Alex
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