Was Kepler guilty of making an assumption?
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beejewel wrote:All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident
beejewel wrote:Don't worry, for most of you guys it won't make any difference which way the planets rotate, just enjoy your cold ale and get on with whatever you are doing. If anyone here is really concerned about which way the planets rotate, just send me a PM, I would be happy to explain why it matters.
beejewel wrote:Don't worry, for most of you guys it won't make any difference which way the planets rotate, just enjoy your cold ale and get on with whatever you are doing. If anyone here is really concerned about which way the planets rotate, just send me a PM, I would be happy to explain why it matters.
Spearthrower wrote:beejewel wrote:Don't worry, for most of you guys it won't make any difference which way the planets rotate, just enjoy your cold ale and get on with whatever you are doing. If anyone here is really concerned about which way the planets rotate, just send me a PM, I would be happy to explain why it matters.
I don't drink, and am doing nothing.... but I am absolutely intrigued to know which way the planet rotates! I'm not really a PM type person though considering it's a public forum, so perhaps you'd be kind enough to enlighten me here?
Spearthrower wrote:beejewel wrote:Don't worry, for most of you guys it won't make any difference which way the planets rotate, just enjoy your cold ale and get on with whatever you are doing. If anyone here is really concerned about which way the planets rotate, just send me a PM, I would be happy to explain why it matters.
I don't drink, ...
Scarlett and Ironclad wrote:Campermon,...a middle aged, middle class, Guardian reading, dad of four, knackered hippy, woolly jumper wearing wino and science teacher.
beejewel wrote:All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident
If we assume (and I shall show later why this assumption is wrong) that the planets move in closed orbits, there ought to be two solutions for velocity, one positive and the other negative. i.e. it is equally valid to say the planets move forwards as it is to say that the planets move backwards (providing the orbit is closed).
campermon wrote:As to 'velocity' and 'speed' - I have no idea what point you are making.
Fortunately thanks to the arrow of time planets do not travel in closed orbits, instead they travel along helical paths, which means there is absolutely no ambiguity about the direction of travel. Think about this for a moment and you will realise which direction planets move. Kepler had a 50/50 chance of getting it right, but failed.
What is the arrow of time?With the exception of Mercury and Mars, all the outer planets are moving backwards with increasing velocities.
Does that include Venus? What about asteroids/comets that cross into the orbits of the inner planets; do they go 'backwards' too or how does it work?The first step to understand is how the passage of time has direction, and how the arrow of time (past to future) points in the direction of lower potential. How do we know this is true?
We know it, because "an apple falling off a branch never fails to arrive in it's own future".
I personally find it quite amazing that such a simple statement can hold such an important truth, but think carefully about it and you will agree that your past is straight up and your future is straight down, at least when standing at rest on earth.
That makes ground potential the present, right?
How do we know which direction is up and down in space? On Earth it is easy, down = towards the center of mass. If we switch to the solar system, down would be towards the sun. For galaxies, down towards the black hole (presumably) in the center.
I don't understand the sentence in italic.So looking up, in the direction of higher potential, we see that the planets Mars, Jupiter, Saturn are all in our past and that we are temporally ahead of them. It is also known that the radius between us and the planets is increasing slightly, which means the planets are not exhibiting closed orbital motion, rather they are tracing out a helical path.
Since we will be traveling to Mars in the near future (say, within 5 decades) and have already sent multiple robots there, are they in the past?
When we communicate with our robots (e.g. send them driving commands) and get a reply, how do they send information forwards in time to us? How do we sent it backwards?This helical spiral is not twisted in the direction Kepler assumed, instead it is twisted in the opposite direction, which means the planets are not moving slower with increasing radius, they are moving backwards faster with increasing radius, which makes a lot more sense to the rational mind.
If the planets are spiraling away from us, does that mean that we should expect to see redshift? https://en.wikipedia.org/wiki/Redshift
If we don't observe that, is that evidence against your model?Maybe you don't quite understand what I mean by backwards, I am not suggesting that the planetary motions are any different to what is being observed, that would be like claiming the Earth is flat, what I have effectively proven above is that the temporal line between the observer and the revolving body is increasing in length, and not decreasing as Kepler's law suggests.
What is the temporal line?In Keplers scenario where the planets move forward, the temporal line will become shorter, meaning the planet will spiral inwards and eventually hit you in the head.
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