Philosophy Lexicon of Arguments

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Objectivity: is a property of determinations about facts. It is assumed that the properties attributed to the facts are determined by the facts and are not, or as little as, influenced by the attributing person. In order to determine whether this requirement is fulfilled, consideration must be given to the methods of access to information. This goes beyond the facts considered.
 
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I 474
Aberration: a telescope must be slightly tilted in the direction of movement of the earth.
((s) while the light is traveling in the telescope, the entire system moves "to the right", i.e., the light enters the eyepiece in the "second" telescope drawn to the right of it.)
Feynman: "squashed ruler".
Because of the contraction effect:

tan Θ = v/c
√ (1 - v²/c²)
or

sin Θ = v/c.

I 475
Objectivity/Objective/Measuring/Aberration/Feynman: how can we say objectively where the star "is" at all?
Solution: 6 months later we have to tilt the telescope in the other direction because of the earth's movement around the sun. This is the only reason why we can determine aberration at all.

Fey
R. Feynman
Vom Wesen physikalischer Gesetze München 1993

Fey I
R. Feynman
Vorlesungen über Physik I München 2001


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Ed. Martin Schulz, access date 2017-05-29