Re: This is What Einstein Actually Did.


kenseto wrote:
"Randy Poe" <poespam-trap@xxxxxxxxx> wrote in message
news:1152714628.812917.98040@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


Second, when you are measuring a velocity of something,
you measure the time and distance separately.

Exactly. But c is not based such a procedure.

No? Please describe any measurement of c prior to 1983
and show me how it doesn't use independent measurements
of time and distance to determine c.

How is the speed of light measured?

http://hermes.physics.adelaide.edu.au/~dkoks/Faq/Relativity/SpeedOfLight/mea
sure_c.html
None of the procedures described in this link uses the method of measuring
the time and distance (using a measuring tape) separately.

First, you are incorrect. The Fizeau and Foucault measurements
in the 19th century are done that way.

Second, to measure the speed of light to 8 or 9 significant digits,
you need to be able to measure time of flight and distance
to 8 or 9 significant digits.

A tape measure is good to maybe 3. That is why the Fizeau
and Foucault measurements are so inaccurate. Michelson
used the same method with more accurate distance and
time measurements to get to nearly 4 figures (he was off
by about 100 km/sec out of 300000). See this link:
http://micro.magnet.fsu.edu/primer/lightandcolor/speedoflight.html
Look for the description of an experiment along the Severn
River in Maryland.

It's still: Measure time, measure distance, divide distance
by time.

Michelson's interferometry allows much more precise
distance measurements, over smaller distances. I'm trying
to find a link to explain exactly how that is used to get
precise measurements of c.

- Randy

.

Relevant Pages

  • Re: deformation monitoring
    ... said:> Only use distance measurements to prisms, reflectorless is ... Couldn't agree more with this - wouldn't be without our Trimble 5600 ...
    (sci.engr.surveying)
  • Re: Ive proved Einstein Wrong. What Happens Now?
    ... When you make up a thought experiment, the only measurements that you ... allow are measurements made at a distance. ... This has nothing whatever to do with clocks, observers, movement ... they are simultaneous in only one reference frame. ...
    (sci.physics.relativity)
  • Re: The Farce that is Called Henri Wilson
    ... No. Maxwell was wrong. ... to determine the distance to the Moon to the cm, ... If the measurements were wrong due to the phenomena ...
    (sci.physics.relativity)
  • Re: This is What Einstein Actually Did.
    ... you measure the time and distance separately. ... The Fizeau and Foucault measurements ... Second, to measure the speed of light to 8 or 9 significant digits, ... using the direct method has not been confirmed. ...
    (sci.physics.relativity)
  • Re: GPS CLOCK PARADOX
    ... Assuming that Lorentz transformation can predict the time and distance ... Let v = velocity of the moving twin M ... the primed system is v w.r.t. the unprimed system ... Only valid for measurements of two sides of an object ...
    (sci.physics.relativity)