• ORBITER-FORUM will be temporarily closed at 2026-07-23 18:00 UTC while we complete some OF maintenance tasks. The amount of downtime is expected to take up to one hour, but probably less.

Search results

  1. L

    Bug Typo in description of website support sub-forum

    The description for the website support sub-forum reads: "Support section for the Orbiter-Forum.con website"
  2. L

    General Question Rigid body model and angular momentum?

    Even if Orbiter isn't localized at all, UTF-8ification is desireable from a modernization perspective: basically all software these days uses Unicode, and Windows is one of the few platforms whose API uses UTF-16 instead of UTF-8. Even on Windows, most applications write UTF-8 to disk and for...
  3. L

    General Question Rigid body model and angular momentum?

    Of course! That's basically exactly the physics that The rotation model.scn is meant to demonstrate.
  4. L

    General Question Rigid body model and angular momentum?

    Basically, if you have an object that has different moments of inertia around all three axes, then rotations around the axis with the minimum moment of inertia and the maximum moment of inertia are stable: if those axes are close to the direction of the angular momentum vector, they will tend to...
  5. L

    Humor Random Comments Thread

    Note that EHT images are radio images: the color palette is completely arbitrary; I believe it was intensity based with no relation to frequency, i.e, basically a black and white image.
  6. L

    The Physics of Sunsets

    My parents have a story about seeing a green sunset after a tornadic thunderstorm, and I've heard other reports of green skies associated with tornadoes. Some quick checks on Wikipedia seem to indicate this really has more to do with the presence of hail-friendly conditions. I've seen a slight...
  7. L

    Two questions regarding special relativity and acceleration

    Let's put it this way: the clock hypothesis definitely holds for special relativity as formulated by Einstein, in which the metric s^2 = t^2-x^2-y^2-z^2 holds. If the criticism of the Kundig and Bailey experiments in the paper linked holds then a different special theory holds, in which the...
  8. L

    Two questions regarding special relativity and acceleration

    The clock hypothesis is an unavoidable consequence of the geometry of Minkowsky spacetime. If it does not hold physically, then Special Relativity is not a description of local physics, nor is General Relativity a description of the physics of the universe as a whole. Frankly, I'm not sure if...
  9. L

    Two questions regarding special relativity and acceleration

    jedidia's questions don't really have much to do with clock synchronization. He's basically asking about elapsed proper time for a relativistic spacecraft traveling between two stars. He isn't really asking about the elapsed time in the rest frame, only what the spacecraft worldline looks like...
  10. L

    Humor Random Comments Thread

    Well, any military flight that doesn't want its presence/identity to be known can still turn its transponder off.
  11. L

    Two questions regarding special relativity and acceleration

    Depends how fast the external reference is traveling: if you drop a wrench off the back of the ship, it will fall behind at 9.81 m/s^2 Velocities don't add, but rapidities do. The one slight wrinkle here is that the space of possible rapidities is hyperbolic, not Euclidean. This doesn't matter...
  12. L

    Two questions regarding special relativity and acceleration

    This is a common misconception: In special relativity, it's only in inertial reference frames that you're guaranteed to be able to formulate the laws of physics identically in every frame, but that doesn't mean that you can't formulate the laws of physics at all in accelerated frames...
  13. L

    Gaming Space simulator: Best sim on mobile or orbiter knockoff?

    Spaceway used its own engine, but I believe it used the orbiter API for MFDs, or else very closely written clones of the core orbiter MFDs.
  14. L

    Two questions regarding special relativity and acceleration

    Just stumbled across a youtube video that does a good job of explaining the geometry of special relativity:
  15. L

    Two questions regarding special relativity and acceleration

    They measure different accelerations (at least if they're calculating acceleration in terms of velocity rather than rapidity). On an x vs. t plot, the spaceship, as seen by the observer, traces a hyperbola that has the speed of light as an asymptote. I'm not much good with integrals either...
  16. L

    Humor Random Comments Thread

    Steal? Not a word I coined, and it's already been in circulation for decades.
  17. L

    Humor Random Comments Thread

    The word you're looking for is "misfeature".
  18. L

    Humor Random Comments Thread

    The Great Plague of 2019 finally visited our house this past week. We all seem to have been hit with a relatively minor strain, but since we all have various risk factors, our various doctors all prescribed Paxlovid. And while it's better than the possibility that the disease might take a...
  19. L

    Humor Random Comments Thread

    I've lived in Europe, and indeed, in the parts of North America with more reasonable climates, so I'm well aware (though also keep in mind that equivalent latitudes here tend to be cooler). One never really gets used to the heat in Dallas in a physical comfort sense, but 40°C-ish temperatures...
  20. L

    Humor Random Comments Thread

    Welcome to literally every summer in Dallas. We tend to measure a hot summer not by the absolute temperature reached, but by the number of consecutive days over 100°F.
Back
Top