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Is the Earth Flat? - Some Evidence Presented

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  • Originally posted by JohnMartin View Post
    The nose should be tipped down if the earth is curved. It's not, so it's not.

    JM
    No, it shouldn't -- for the fifth+ time!

    The entire aircraft is level, i.e. perpendicular to the gravity vector. If you believe in Calculus, consider the plane (the geometrical abstraction, not the aircraft) tangent to the sphere of the Earth at the point directly under the aircraft, the aircraft is level with that plane - and continues to be level with the tangent plane as the aircraft proceeds.

    Thus, the aircraft is always level while at cruising altitude.

    Comment


    • Originally posted by JohnMartin View Post
      The sagitta is the distance from the chord to the high point of an arc. If the earth is curved, then the flight is over an arc with a sagitta. If the flight does not account for the sagitta, then the flight is over flat ground. your statements are nonsense.

      JM
      At cruising altitude the altitude remains basically unchanged, and since the aircraft is level (meaning it follows the curvature of the Earth remaining perpendicular to the gravity vector), thus there is no sagitta in the flight path.

      Intuitively self-evident to all but the most ignorant...

      Flat-Earthism is refuted.

      Q.E.D.

      Comment


      • Originally posted by klaus54 View Post
        No, it shouldn't -- for the fifth+ time!

        The entire aircraft is level, i.e. perpendicular to the gravity vector. If you believe in Calculus, consider the plane (the geometrical abstraction, not the aircraft) tangent to the sphere of the Earth at the point directly under the aircraft, the aircraft is level with that plane - and continues to be level with the tangent plane as the aircraft proceeds.

        Thus, the aircraft is always level while at cruising altitude.
        [nitpicmode]
        Actually - the aircraft is nose up a few degrees as the typical angle of attack for a commercial aircraft at cruising speed at altitude is not 0
        [/nitpicmode]
        My brethren, do not hold your faith in our glorious Lord Jesus Christ with an attitude of personal favoritism. James 2:1

        If anyone thinks himself to be religious, and yet does not  bridle his tongue but deceives his own heart, this man’s religion is worthless James 1:26

        This you know, my beloved brethren. But everyone must be quick to hear, slow to speak and slow to anger; James 1:19

        Comment


        • Originally posted by Sparko View Post
          [ATTACH=CONFIG]13301[/ATTACH]

          You only have to worry about sagitta on a flat earth. (right side). On a curved earth the arc follows the curve of the earth, making the flight a level flight with the terrain.
          You only have to worry about the sagitta on the left which is real, because the sagitta in the flight on the right does not exist. You have denied the existence of the sagitta on the left which does exist and then asserted the sagitta on the right, which does not exist in the real. You have the sagitta problem backwards. Embarrassing.

          JM

          Comment


          • Originally posted by Sparko View Post
            I will do so once you explain why hurricanes always rotate counterclockwise in the northern hemisphere while their counterparts in the southern hemisphere, cyclones, always rotate clockwise. You first.
            Local aether flow in relation to a rotating universe. The other cloud masses do not rotate because of a lack of local aether flow.

            JM

            Comment


            • Originally posted by oxmixmudd View Post
              Isn't it simply amazing how many threads that look like they ought to spur lots of discussion languish after 2 or 3 pages, but John Martin has yet to put up a thread that ends in less than 70 pages, most of them were/are over 100, and while the specifics can get interesting (at least in the old geocentrism threads) it does seem that we are drawn like moths to the flame to the sheer inanity of what he says. It's like a circus show. We simply can't believe what we are seeing, and we must see more and more and more just to convince ourselves what we saw is what we saw



              Jim
              I cant believe what I am seeing. Jim makes these claims and yet after 629 posts there is nothing here to undermine the flat earth claims concerning being able to see long distances beyond that predicted of a global earth model.

              JM

              Comment


              • Originally posted by klaus54 View Post
                No, it shouldn't -- for the fifth+ time!

                The entire aircraft is level, i.e. perpendicular to the gravity vector. If you believe in Calculus, consider the plane (the geometrical abstraction, not the aircraft) tangent to the sphere of the Earth at the point directly under the aircraft, the aircraft is level with that plane - and continues to be level with the tangent plane as the aircraft proceeds.

                Thus, the aircraft is always level while at cruising altitude.
                The tangent plane changes orientation as the plane orbits the earth. The tangent plane orientation changes, so the 747 nose must be tipped. The gravity vector also changes orientation as the plane orbits the earth. These changes mean the 747 must always tip the nose to align with the tangent plane and gravity vector which both change orientation as the plane orbits the earth.

                Thus, the aircraft is always level while at cruising altitude, only if the earth is flat.

                JM
                Last edited by JohnMartin; 02-16-2016, 03:52 PM.

                Comment


                • Originally posted by klaus54 View Post
                  At cruising altitude the altitude remains basically unchanged, and since the aircraft is level (meaning it follows the curvature of the Earth remaining perpendicular to the gravity vector), thus there is no sagitta in the flight path.

                  Intuitively self-evident to all but the most ignorant...

                  Flat-Earthism is refuted.

                  Q.E.D.
                  False. On a globe the flight is perpendicular to the gravity vector, which changes orientation relative to the earth. The change in orientation of the gravity vector implies an arc, which implies a sagitta. The flights cruise at uniform altitude because the earth does not have a change in orientation of the gravity vector, nor an arc, nor a sagitta.

                  JM

                  Comment


                  • Originally posted by oxmixmudd View Post
                    [nitpicmode]
                    Actually - the aircraft is nose up a few degrees as the typical angle of attack for a commercial aircraft at cruising speed at altitude is not 0
                    [/nitpicmode]
                    Which infers no arc and no global earth under the 747.

                    JM

                    Comment


                    • Originally posted by oxmixmudd View Post
                      [nitpicmode]
                      Actually - the aircraft is nose up a few degrees as the typical angle of attack for a commercial aircraft at cruising speed at altitude is not 0
                      [/nitpicmode]
                      Good point.

                      Now watch JM misinterpret this.

                      My posts were simply to illuminate that "level" doesn't require a flat Earth.

                      Comment


                      • Originally posted by JohnMartin View Post
                        Which infers no arc and no global earth under the 747.

                        JM
                        For at least the sixth time, on a spherical Earth "straight down" is determined by the gravity vector which is perpendicular to the surface tangent plane. And "level" means parallel to the tangent plane (or equivalently, perpendicular to the gravity vector.)

                        Sheesh...

                        Comment


                        • Originally posted by JohnMartin View Post
                          You only have to worry about the sagitta on the left which is real, because the sagitta in the flight on the right does not exist. You have denied the existence of the sagitta on the left which does exist and then asserted the sagitta on the right, which does not exist in the real. You have the sagitta problem backwards. Embarrassing.

                          JM
                          Translation anyone?

                          Comment


                          • Originally posted by oxmixmudd View Post
                            [nitpicmode]
                            Actually - the aircraft is nose up a few degrees as the typical angle of attack for a commercial aircraft at cruising speed at altitude is not 0
                            [/nitpicmode]
                            JM -- note that this is not consistent with your spherical Earth strawman.

                            Comment


                            • Originally posted by JohnMartin View Post
                              Local aether flow in relation to a rotating universe. The other cloud masses do not rotate because of a lack of local aether flow.

                              JM
                              "... And then a miracle happens" is not a sufficient scientific explanation.

                              Comment


                              • Originally posted by JohnMartin View Post
                                False. On a globe the flight is perpendicular to the gravity vector, which changes orientation relative to the earth. The change in orientation of the gravity vector implies an arc, which implies a sagitta. The flights cruise at uniform altitude because the earth does not have a change in orientation of the gravity vector, nor an arc, nor a sagitta.

                                JM
                                No. Relative to Earth the gravity vector is always perpendicular. To an observer in space the vector would appear to rotate. Find a ball and on run your finger around it all the while keeping it perpendicular to the surface. Whadda ya see?

                                A small Gedanken: In similar way, if one were to observe Earth from a distance with north "up", you Kiwis would appear to be upside-down (kinda like your philosophy!)

                                Frames of reference are not your thing.

                                Comment

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