Paul, There are a couple of points I could make here but i realy want to focus you on only one....the earth is in "Free fall" toward the sun ,so you say.....the tides are caused by an acceleration toward the sun........Thus, we detect that acceleration in free fall!...... PS If Regener wants to attempt to reduce the daily tides due to sun and moon to a "proportional effect" to the centrifical effects & or only a 7 mm difference, then you create a whole new problem with the centrifical force...The reason?.... because the for a orbit to be stable the forces toward sun must be balneced with the forces from the stars that create the centrifical force outward....other wise your forces are not balenced so even if you could maintain that orbit wihtout some additonal force to keep you int it.......you would not be in free fall toward stars and sun you would only be in free fall wrt the sun or the stars but not both and thus we should expect to detect the differneces................ darn you guys, just cant get around issue without robing somthing from Peter to pay Paul....... ----- Original Message ---- From: Paul Deema <paul_deema@xxxxxxxxxxx> To: Geocentrism@xxxxxxxxxxxxx Sent: Monday, May 12, 2008 8:42:20 AM Subject: [geocentrism] Accelerometers Greetings several ... Points relating to accelerometers have appeared under several threads so I thought that perhaps it ought to have its own. Hope this doesn't upset anybody. Too many points have been made in the last few days to reply to each in any depth. Let me make a few comments. Neville - "Einstein taught us that gravity and acceleration are one and the same." This is perfectly true. Prompted by Philip's quotes from Wiki, I too read the same and other articles. I don't see that they are one and the same. I see that they are -- roughly -- equivalent. As Philip remarked, we are talking here about 'artificial gravity' and if you look more closely, it breaks down. Linear acceleration -- a rocket -- produces increased weight but no tidal forces ie every atom is affected identically especially those at the leading end wrt those at the trailing end. Radial acceleration will also produce increased weight but now we have Coriolis effects plus differential acceleration -- your feet will weigh more than your head. It seems to me that MS reserves General Relativity as a sort of tool of last resort. This strikes a chord with me. It also suggests that we don't have to bring in Relativity if Newton can solve the problem and so far as I can see, there is very very little in the Solar System which requires Einstein. Certainly the gravity and acceleration encountered can be examined adequately for our purposes here without recourse to relativity. Allen - I threw you a bone on two occasions but you apparently were too busy calling me a bonehead to notice. In any event you did not acknowledge them, so I'll explore that point here in more detail. You have been absolutely resolute in your refusal to address my accelerometer proposition (the red sphere and the green sphere) so I'll propose something similar to which you may be able to relate. If a tap is opened and water -- a fluid -- is allowed to flow out to fall a great distance -- for convenience let us consider that gravity and therefore acceleration is constant over the distance of the fall -- the velocity of every drop of that water is different from every other drop. Those at the bottom are moving faster than those just emerging from the tap. In fact, what begins as a steady stream, shortly becomes a string of spherical drops as the stream of water stretches further and further until it becomes so thin that surface tension causes it to break into discrete portions. Now let us take instead a long rod of metal -- a solid -- and suspend it into a gravity field whose intensity -- over the length of the rod -- varies markedly. If we release the rod so that it falls longitudinally, we will notice that there will be stress over the length of the rod due to the fact that the end closest to the centre of gravity is accelerated at a greater rate than that which is farthest. Theoretically at least, if the rod were to be divided at the centre and the two halves joined with a rigid strain gauge, the acceleration could be measured. Taking it a little further, a very long spaceship in a very elliptical orbit about the Sun -- longitudinally aligned with the path -- would have its leading end subjected to greater acceleration than its trailing end on the inbound path and the reverse on the outbound. If we were to place an accelerometer in each end, then they would each read differently from the other (the spaceship being rigid) and the difference could be used to compute the acceleration. This satisfies your assertion that acceleration due to gravity can be determined during an orbit. How you would achieve this on Earth's surface we have yet to hear. None of this however refutes the assertion that an accelerometer cannot detect its own acceleration when accelerating in a gravity field. It will only register acceleration if it is rigidly placed at a significant distance from the centre of gravity of the object whose acceleration we wish to determine and for all practical purposes you have yet to show -- with numbers would be convincing -- how this might be achieved (for example you have mentioned gravity assist maneuvers) within the distinctly limited confines of interplanetary exploration vehicles. For a very relevant comment, see here - http://www2.jpl.nasa.gov/basics/grav/run.html Finer points: At the top of this page is the question, "...what's the difference?" Well, of course with magnetism, the "spacecraft" BB doesn't have its own pull on the Jupiter magnet. The magnet does all the pulling. As it does, the Jupiter magnet feels a backward tug as it supplies the energy to accelerate the BB. Another fine point is that if you were to place an accelerometer on the BB, it would register acceleration as the boost takes place. This would not be true on a spacecraft. A spacecraft feels nothing but continuous freefall as it picks up a large increment of speed during a gravity assist. This is because of the balance in gravitational tug as the spacecraft pulls on Jupiter and vice-versa. [Emphasis added] Paul D ________________________________ Get the name you always wanted with the new y7mail email address.