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Ekkehard Friebe Ekkehard Friebe ist männlich
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Dabei seit: 23.11.2005
Beiträge: 1154

Relative Velocity between the Source and the Observer Zitatantwort auf diesen Beitrag erstellen Diesen Beitrag editieren/löschen Diesen Beitrag einem Moderator melden       IP Information Zum Anfang der Seite springen

Folgenden Beitrag von Paul Marmet, Kanada, zur Relativgeschwindigkeit zwischen Lichtquelle und Beobachter halte ich f?r sehr wichtig:

Relative Velocity between the Source and the Observer
http://www.newtonphysics.on.ca//faq/rel-velocities-1.html


Nachstehend bringe ich die ersten Textabs?tze dieses Beitrags:


Zitat:

Relative Velocity between the Source and the Observer.

In modern physics, there are frequent discussions about the observation of light from a remote source. It is generally stated that the phenomenon observed depends on the relative velocity between the source of light and the observer. We must therefore investigate whether this statement is compatible with observations. We show here an example in which the change of velocity of the emitting source does not produce an effect corresponding to that statement. In that case, such a phenomenon depends only on the observer?s velocity independently of the emitter velocity.

The origin of observations involving only the observer?s velocity is as old as 1725. James Bradley observed the star g Draconis on 3. December 1725, when it was passing just above his observing location. He was using a telescope affixed to a vertical chimneystack, in such manner as to permit a small oscillation of the eyepiece. After several days of observation, he observed that the star was moving southwards. The observations were continued, and after a year, he concluded that the star made a full north-south oscillation, which was repeated during the following years. All stars around the observed location were doing the same oscillation. After serious considerations, it was finally understood that this oscillation of the position of the star is due to the proper velocity of the Earth around the Sun. Since the Earth is moving around the Sun, stars appear to be shifted in the direction of the Earth's motion (this is analogous to raindrops falling on a person walking). In fact, Bradley used these observations to make the best known determination of the velocity of light of his time. This apparent motion of the star is called ?star aberration?. [?..]

In modern physics, it is generally claimed that star aberration discovered by Bradley occurs when there is a relative motion between a source of light and an observer. This idea probably results from the influence due to the Einstein?s Relativity Principle, but it is easy to show that this belief is not compatible with obvious experimental observations. Since the time Bradley observed the apparent motion of the light source due to the Earth velocity, numerous astronomical observations provided information about the proper velocities of emitting stars.

In astronomy, many binary stars are observed. The velocity of each star forming a binary system can be determined in a very reliably way, using the laws of classical mechanics. This is compatible with the observations. Many of the binary stars possess orbits in the same plane as the Earth. Furthermore, the less massive star in those systems, generally have velocity components, which are much larger that the Earth velocity around the Sun. Consequently, at some instants during the period of the orbit, the star possesses a velocity, which is equal to the Earth velocity. Therefore, at that instant, the ?relative velocity of the star with respect to Earth is zero?.

At some other time, the velocity component of that star is very large, so that its velocity becomes much larger than the Earth velocity. Consequently, if the star aberration is due to ?the relative velocity between the source and the observer?, there should be a very large "star aberration" observed from Earth. Therefore, during the period of the orbiting star, that star should oscillate due to the star aberration, if we apply the principle of ?relative velocity between the source and the observer? (on Earth). In some binary star systems, the star velocity is so large that one should observe a star aberration, which should be 10 and even 100 times larger than the amplitude observed by Bradley.

(Zitatende, Hervorhebungen durch Friebe)



Lesen Sie bitte weiter unter:

Relative Velocity between the Source and the Observer
http://www.newtonphysics.on.ca//faq/rel-velocities-1.html



Beste Gr??e Ekkehard Friebe

04.07.2007 14:34 Ekkehard Friebe ist offline Email an Ekkehard Friebe senden Homepage von Ekkehard Friebe Beiträge von Ekkehard Friebe suchen Nehmen Sie Ekkehard Friebe in Ihre Freundesliste auf
garfield335
User gesperrt!


Dabei seit: 09.05.2007
Beiträge: 93

Re: Relative Velocity between the Source and the Observer Zitatantwort auf diesen Beitrag erstellen Diesen Beitrag editieren/löschen Diesen Beitrag einem Moderator melden       IP Information Zum Anfang der Seite springen

Lieber Herr Ekkehard,

Ich w?rde mich freuen, wenn ich einmal ihre eigene Stellungnahme zu diversen Themen lesen w?rde, aber leider posten sie nur Zitate,

04.07.2007 14:43 garfield335 ist offline Email an garfield335 senden Beiträge von garfield335 suchen Nehmen Sie garfield335 in Ihre Freundesliste auf
Jocelyne Lopez
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Dabei seit: 23.11.2005
Beiträge: 3091

Re: Relative Velocity between the Source and the Observer Zitatantwort auf diesen Beitrag erstellen Diesen Beitrag editieren/löschen Diesen Beitrag einem Moderator melden       IP Information Zum Anfang der Seite springen


Zitat:

garfield335 schrieb am 04.07.2007 14:43 Uhr:
Lieber Herr Ekkehard,

Ich w?rde mich freuen, wenn ich einmal ihre eigene Stellungnahme zu diversen Themen lesen w?rde, aber leider posten sie nur Zitate,



Ich bitte Dich ausdr?cklich, Teilnehmer dieses Forums nicht zu bedr?ngen und zu bel?stigen. Keiner mach Dir hier Vorschriften, in welcher Form Du Dich hier beteiligen solltest oder auch nicht, oder?

Wenn Du speziell Interesse zu "eigenen Stellungnahmen zu diversen Themen" von Ekkehard Friebe hast, dann kannst Du zum Beispiel sie auch in seiner Hompepage nachlesen. Da wirst Du eine Weile besch?ftigt sein. So viel hast Du wohl selbst nicht geleistet. Deine "eigenen Stellungnahmen zu diversen Themen" vermissen wir zum Beispiel in diesem Forum g?nzlich, au?er Polemik und Trollerei.

Dies ist ein Forum zur Information und zum Austausch. Jeder soll sich daran beteiligen, wie er sich es w?nscht und f?r richtig h?lt. Unterlasse es also, Gespr?chspartner zu bedr?ngen oder vertrolle Dich.

Siehe auch meine soeben ausgesprochene Verwarnung in einem anderen Thread.

Jocelyne Lopez

04.07.2007 15:58 Jocelyne Lopez ist offline Email an Jocelyne Lopez senden Homepage von Jocelyne Lopez Beiträge von Jocelyne Lopez suchen Nehmen Sie Jocelyne Lopez in Ihre Freundesliste auf
 
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