Re: Relativistic aberration

On Wed, 17 Jul 2024 7:05:15 +0000, Thomas Heger wrote:

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Am Dienstag000016, 16.07.2024 um 16:47 schrieb gharnagel:

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"Why is the speed of light so slow when the universe is such a really,
really big place?" -- G. L. Harnagel

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This is a tautology:
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What we see in the night sky is actually our own past light-cone.

Ah, but if we can develop tachyon astronomy, that will not be true!

This means: light is relatively slow for the wastness of the universe,
hence we can see everything only with a certain delay and the further
away, the longer the delay, according to x = c* t
(with x= distance in meters, t = delay in seconds).
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This 'longer away' is usually measured in light years and the delay in
years.
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Since the night sky shows only a delayed image of past events, the speed
of light cancels out of the equations and we can put any value into it
and always get a valid picture of the universe.
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So we only assume, that light moves always with ~300 million meters per
second through the entire universe.
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But if light would speed up or slow down, we would not be able to
measure this, because we always see the own light cone in the night sky
and c is already embedded into it (for whatever a value c actually has
in outer space).
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TH

Ah, but the fine structure constant, which is pertinent to how stars
shine,
includes the speed of light.  That implies that c is the same throughout
space and time, n'est-ce pas?