Cool yeah, dug through the maths and took the time to understand the situation you were describing and I understand now.

I thought you were describing a something else, and then slightly confused myself by only considering the metric and not the global picture. I was trying to abuse some old heuristic techniques and they don’t quite work for this case, though it was fine for what I was picturing, where Jane and Alice are symmetric about Bob.

Thanks for taking the time to convince me.

Actually reading back over this is hilariously dumb, forgive my bad reading comprehension, that is how redshift works.

Would you agree that, at the moment they pass each other, Alice and Jane would see different points in Bob’s history as being simultaneous in their respective reference frames?

I wouldn’t say that’s necessarily true, no. It’s only true if their speeds are different, the direction they’re travelling doesn’t factor into it. In either case, their lines of constant time are the same because space is rotationally symmetric. I’m not thinking of them adjusting their calculations to some “true” sense of simultaneous, if that’s what you meant in your edit, because there isn’t one by definition.

And it’s related to distance because the further they are from Bob, the greater the discrepancy in their calculations of Bob’s relative time will be.

That really depends on what you mean by time shift in your original comment. If you mean the shift in what they perceive as simultaneous, then it’s not, but it seemed to me that’s what you meant. If you mean the difference in their age then I honestly can’t remember how it factors in for the accelerating case, I haven’t had to think about SR problems in a while.

I don’t think this is true, you’re right that what’s considered simultaneous changes*, but it’s not related to distance and that’s not how redshift works.

At best Alice could use the redshift to work out how fast she’s moving relative to Bob, if she’s moving towards and away from him at the same speed, she’ll always get the same result. She’d actually think the same moments are simultaneous regardless of direction.

The time difference is only accumulated during her acceleration so it can only be measured during it.

*but only when her speed is different

If you want to get really technical, it’s because the symmetries of the Minkowski metric are the Poincaré group. Which includes only rotations, translations and boosts, none of which correspond to acceleration. Meaning it’s inherently impossible to make acceleration look like being stationary because of the geometry of spacetime.

If Alice flies by Bob at some relativistic speed, then there’s a very simple coordinate transform (a Lorentz boost) that flips our perspective to Alice’s pov; she’s stationary and Bob is moving.

If Alice were to accelerate and we did the same thing, we’d end up with a “momentarily comoving reference frame,” in which Alice is only “stationary” for an instant and Bob is moving at a constant speed as before. Or we could create a non-inertial reference frame which would look nothing like Bob’s perspective, but Alice would be stationary.

Physics in non-inertial frames behaves differently, as a simple example: if stationary (or constant speed) Bob dropped an object while floating in space, it would remain there. If accelerating Alice tried the same thing, it would accelerate away from her. You can test this out in an accelerating car or train or whatever and see that it’s fundamentally asymmetrical even before considering SR.

In terms of things like length contraction and time dilation, these are a little more complicated mathematically, but it’s just an extension of the above asymmetry when spacetime is Minkowski rather than Euclidean. The difference in observed time is clear when looking at each person’s worldline, Alice’s isn’t straight like Bob’s and so she unambiguously experiences a different proper time and proper length.

Ultimately this means that even if Alice accelerates then passes Bob at a constantly speed, they’ll both see one another’s clocks running slow by the same amount, when Alice decelerates and returns to compare her stopwatch with Bob’s they’ll have very different totals which corresponds to how much time Alice lost during her acceleration.

I’ve had mixed luck, some just don’t work on Linux regardless, legit or cracked, but fitgirl repacks generally work well in my experience.

I’ve been unpacking/installing them by adding the setup exe to steam as an external game, enabling proton GE and running the installer. The annoying part is then grabbing the installed files from the steam directory and then adding the gamr exe to steam as a separate thing I can actually launch. I tried normal wine. Normal wine did not work (on my distro at least, it’s complicated :/).

it doesn’t work very well when set to votes only either, it barely seems to function at all now…

It’s just a regulated amount set by the government of each region, the manufacturers want to make them as profitable as possible, but the regulations say they can only be so profitable. The thing is, if you’re losing 2% per game, it doesn’t seem like much, but the point of slots is you play a lot of games, people sit there for hours and hours and the machines can run multiple games at once in some cases. You can lose all your money quite quickly.

I never worked on physical machines so I can’t really answer any questions about coins, I just got data sheets with the reels on them and info about stuff like custom rules and bonus rounds.

It depends on the region, we were certifying globally. I don’t remember the numbers that well, it was years ago and I only did a few months there, but I think it’s something like a 98% return for the player, so if you put $1 in, you get 0.98¢ back on average.

Very sarcastic comment, but if the traffic is bad enough then it becomes safe to cycle again because of how little anyone in a car can move.

I mean yeah, that makes sense. The Labor government has been up for sale for years

I very briefly had a job as a mathematician for a company that certifies pokies (slot machines). I was technically also a software dev, but my job mainly consisted of calculating the theoretical average returns for each machine, writing basic code to simulate the machine for millions of games and then making sure those two numbers matched. I’d pass that on to a physical testing team who hack them to run real games.

It was a horrible fucking job and I got out basically a month after I finished my training. All we did was prove the machines were exactly as profitable as allowed in whatever location they were going to be deployed at…

Now I work as a regular software developer and it’s also a horrible job.

The comparison with the Sydney Metro is silly, they’re extremely different projects. Melbourne’s metro tunnel isn’t a metro, it’s a badly named but very welcome change to make some suburban lines through running.

The fossil fuel industry doesn’t pay enough in taxes for it to be worth it tbh, it’s just making a handful of very rich people even more so…

Uhhh the history of how Labour introduced neoliberal anarchy to Australia and then made it queer???

None in particular, I want my US friends to be able to escape persecution and be here where they’re safe

My job only exists because it was cheaper to hire several thousand tech workers to replace all the oracle products in house over several years than to keep using Oracle lmao

The anarchist-faq will get you most of the way there, and the K-On manga will fill in the gaps.

It’s always going to be a personal preference kind of thing. Personally I don’t really care much about “passing” and I’m usually completely okay being outwardly trans, unless it’s being used to harass/bully.

I had a weird experience the other day when getting an ultrasound where I told the tech I was obviously on HRT which she immediately denied. I get she was trying to be supportive, but it kinda just made me feel worse because of how awkward it was lol.

I love this stuff, I always put it on my face. It’s just enough to stop feeling like my skin is as dry as paper and it’s not oily, it feels more watery than anything. I switched to it years ago, use it after every shower and now my skin is so nice, presumably just because I’m not leaving my face all dried out, I doubt there’s anything special about this stuff.

That said, I do also use a very gentle sorbolene body wash and hand soap because my skin was too fragile for normal soap. If I don’t, I tend to get lots of sores on my fingers.

A favourite phrase of mine that comes up in so many different areas of life is: “soft on people, hard on structures.” Individuals tend to be pretty good, genuine and caring people.

It’s much like how an atheist might be a great person, but the new atheist movement became a festering cesspool of anti-feminist right wing bigotry. Having a religion doesn’t change much really, shit people are universal.