Countries with sane laws include a tolerance limit to take into account flaws in speedometers and radars. Here in Brazil, the tolerance is 10%, so tickets clearly state "driving at speed 10% above limit".
I don't know enough of the 8086 so I don't know if this works the same, but on the Z80 (which means it was probably true for the 8080 too), XOR A would also clear pretty much all bits on the flag register, meaning the flags would be in a known state before doing something that could affect them.
The last thing we need is more enshitification on this space.
I just migrated my selfhosted email server to Hetzner and I don't want them turning into monstrosity like AWS or Azure, with theit miriad of ways to nickel and dime the customers.
That is assuming the objects will be at the same place relative to us, which is not true. Like reaching Andromeda. Voyager I will reach oyr neighbouring galaxy in roughly 4.5 billion years, not 45, that's because Androneda is moving in our direction. Reaching Proxima Centaury would take longer than your estimation because of it's orbit around Alpha Centauri A/B.
Estimating time-to-arrival when your destination is also moving at ludicrous speeds is incredibly difficult.