"Light Speed and Special Relativity"Just look at his graphs at the end.
António Saraiva – 2009-09-13 https://www.gsjournal.net/Science-Journals/Research%20Papers-Relativity%20Theory/Download/2812
"Light Speed and Special Relativity"
António Saraiva – 2009-09-13 https://www.gsjournal.net/Science-Journals/Research%20Papers- Relativity%20Theory/Download/2812
Den 16.03.2025 00:47, skrev LaurenceClarkCrossen:Saraiva showed by the two graphs that the time between the eclipses of
"Light Speed and Special Relativity"
António Saraiva – 2009-09-13
https://www.gsjournal.net/Science-Journals/Research%20Papers-
Relativity%20Theory/Download/2812
In the following are the statements in quotation marks
quotations from the the paper above:
"The given facts in this analysis are:"
"The light from Jupiter takes 1003 seconds to cross from
the near point of Earth's orbit to the far point at the speed
of 300,000 km/sec, (c) in relation to Jupiter."
My comment:
The light from Jupiter will cross Earth's orbit twice.
The light will use the time 2AU/c = 998 seconds.
"It is known that Earth takes about 200 days to make this same trip.
The Earth's average retreating speed in relation to Jupiter is
17.361 km/sec."
My comment:
The orbital speed of Jupiter is 13.1 km/s, and the orbital
speed of the Earth is 29.8 km/s.
Since the orbits are two concentric circles the retreating
speed varies from 0, to 29.8 km/s, back to 0, to -29.8 km/s,
and back to 0.
The average is ~0. Which is utterly irrelevant.
"When two things race between two points at the same time at differing
speeds,... they have a relative speed that is equal to the difference
between the highest and lowest speed. Therefore the average relative
speed is approximately 300,000 minus 17.361 km/sec."
This is an awkward way of stating:
If the speed of light relative to Jupiter is c, then the speed of light
will vary between c + 29.8 km/s and c - 29.8 km/s relative to the Earth.
Let us express it correctly:
In the inertial rest frame of Jupiter the speed of light is c,
and the speed of the Earth is -29.8 km/s.
The speed difference is c-29.8 km/s. (sometimes called "closing speed")
In the inertial rest frame of the Earth the speed of light is c,
and the speed of Jupiter is -29.8 km/s.
The speed difference is c-29.8 km/s.
That the speed of light is invariant means that it is c in all
inertial frames of reference.
If you express it as "the speed of light is c relative to all
objects", it may be right, but is prone to be misunderstood,
as Saraiva did.
But what Savira really did, was to claim: The speed of light
is not invariant, because the speed of light isn't invariant.
On Sun, 16 Mar 2025 22:12:08 +0000, Paul.B.Andersen wrote:
Den 16.03.2025 00:47, skrev LaurenceClarkCrossen:
"Light Speed and Special Relativity"
António Saraiva – 2009-09-13
https://www.gsjournal.net/Science-Journals/Research%20Papers-
Relativity%20Theory/Download/2812
In the following are the statements in quotation marks
quotations from the the paper above:
"The given facts in this analysis are:"
"The light from Jupiter takes 1003 seconds to cross from
the near point of Earth's orbit to the far point at the speed
of 300,000 km/sec, (c) in relation to Jupiter."
My comment:
The light from Jupiter will cross Earth's orbit twice.
The light will use the time 2AU/c = 998 seconds.
"It is known that Earth takes about 200 days to make this same trip.
The Earth's average retreating speed in relation to Jupiter is
17.361 km/sec."
My comment:
The orbital speed of Jupiter is 13.1 km/s, and the orbital
speed of the Earth is 29.8 km/s.
Since the orbits are two concentric circles the retreating
speed varies from 0, to 29.8 km/s, back to 0, to -29.8 km/s,
and back to 0.
The average is ~0. Which is utterly irrelevant.
"When two things race between two points at the same time at differing
speeds,... they have a relative speed that is equal to the difference
between the highest and lowest speed. Therefore the average relative
speed is approximately 300,000 minus 17.361 km/sec."
This is an awkward way of stating:
If the speed of light relative to Jupiter is c, then the speed of light
will vary between c + 29.8 km/s and c - 29.8 km/s relative to the Earth.
Let us express it correctly:
In the inertial rest frame of Jupiter the speed of light is c,
and the speed of the Earth is -29.8 km/s.
The speed difference is c-29.8 km/s. (sometimes called "closing speed")
In the inertial rest frame of the Earth the speed of light is c,
and the speed of Jupiter is -29.8 km/s.
The speed difference is c-29.8 km/s.
That the speed of light is invariant means that it is c in all
inertial frames of reference.
If you express it as "the speed of light is c relative to all
objects", it may be right, but is prone to be misunderstood,
as Saraiva did.
But what Savira really did, was to claim: The speed of light
is not invariant, because the speed of light isn't invariant.
Saraiva showed by the two graphs that the time between the eclipses of
Io varies in trends. When Earth and Jupiter move apart, the eclipses are increasingly further apart in time, and vice versa. This would require
that the relative speeds of Jupiter and Earth affect the relative speed
of light.
Den 16.03.2025 00:47, skrev LaurenceClarkCrossen:
"Light Speed and Special Relativity"
António Saraiva – 2009-09-13
https://www.gsjournal.net/Science-Journals/Research%20Papers-
Relativity%20Theory/Download/2812
Saraiva showed by the two graphs that the time between the eclipses of
Io varies in trends. When Earth and Jupiter move apart, the eclipses are increasingly further apart in time, and vice versa. This would require
that the relative speeds of Jupiter and Earth affect the relative speed
of light.
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