• Knock_Knock_Lemmy_In@lemmy.world
    link
    fedilink
    English
    arrow-up
    1
    ·
    7 months ago

    If the machine has the ability to jump in time and space (needed to land in the same spot) then it would be a real waste to use it only on earth.

    So we would need a mathematical model of the entire universe that is accurate to the metre over all time. This N body is much harder than the 3 body problem.

    Or we use gravity and other methods to track relative stationary position.

    So, what other methods can be used to determine rotation?

    • Atomic
      link
      fedilink
      English
      arrow-up
      1
      ·
      7 months ago

      Jesus fucking Christ. We can still calculate the rotation of a body like we normally do.

      You observe it. Wait 1 seconds. Observe it again. And the delta in position is your rotational speed per second.

      That is the method. The only one

      • Knock_Knock_Lemmy_In@lemmy.world
        link
        fedilink
        English
        arrow-up
        1
        ·
        7 months ago

        So all travels to new planets require 2 jumps. One to get near and measure the rotation, and one to actually land. I’d prefer something more efficient.

        Also there is the assumption that the surface rotational velocity is constant over time. This is only true for solid planets without gas or liquid centers. Insides can spin at different speeds than the surface.

        • Atomic
          link
          fedilink
          English
          arrow-up
          1
          ·
          7 months ago

          I don’t even know what this conversation is about anymore. You wanna go inside a gas giant now?

          How about this. When you develop timetravel through space in all dimensions to “jump” anywhere at any time. Let us know.

          • Knock_Knock_Lemmy_In@lemmy.world
            link
            fedilink
            English
            arrow-up
            2
            ·
            7 months ago

            I don’t even know what this conversation is about anymore.

            It’s about how a theoretical time/space machine would navigate obeying current physics knowledge.

            You wanna go inside a gas giant now?

            I’d like the option. I’d certainly like to land on planets with liquid cores.

            How about this. When you develop timetravel through space in all dimensions to “jump” anywhere at any time. Let us know.

            Nah. Let’s design the solution now so it’s ready to be used when needed.

            • Atomic
              link
              fedilink
              English
              arrow-up
              1
              ·
              7 months ago

              When developing. You solve one problem a time. So you don’t spend time trying to calculate rotation from gravity.

              The beauty of a time machine on earth. Is that we can imagine most of it, and add the time travel part with our imagination to make it “plausible”

              You want to add instant teleportation to any point in space at any time, while knowing everything about every planet and star including their location. Instantly.

              I have a magical spell that already does everything you want. It’s called “goannoyium-someoneelsium-fuckwad”.

              I already solved your little problem

              • Knock_Knock_Lemmy_In@lemmy.world
                link
                fedilink
                English
                arrow-up
                1
                ·
                7 months ago

                You want to add instant teleportation to any point in space at any time, while knowing everything about every planet and star including their location. Instantly.

                Teleportation is not being added by me. It’s the topic of this entire thread. Even calculating the rotation of just the earth at other points in time is not trivial because Earth has an unobservable liquid core.

                I have a magical spell that already does everything you want. It’s called “goannoyium-someoneelsium-fuckwad”. I already solved your little problem

                No. You didn’t.

                  • Knock_Knock_Lemmy_In@lemmy.world
                    link
                    fedilink
                    English
                    arrow-up
                    1
                    ·
                    6 months ago

                    Did we? The inner core maybe, but there’s definitely some liquid somewhere, cos of volcanoes.

                    It’s not something that is currently predictable though. We don’t have decent models for the magnetic field.

                • Atomic
                  link
                  fedilink
                  English
                  arrow-up
                  1
                  ·
                  7 months ago

                  I did. The spell puts anyone anywhere at anytime. And it works by whatever exact imaginative solution that doesn’t exist you want. Pretty cool huh.