Timeline for How to calculate the time on planet B for an event that happened on planet A?
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 18, 2020 at 22:35 | vote | accept | JBH | ||
| Sep 20, 2020 at 17:15 | comment | added | Justin Thyme the Second | Like I said, damned dam. Botches everything up. Reality meets fiction. Nothing can destroy a great theory like a ruthless gang of facts. | |
| Sep 20, 2020 at 17:09 | comment | added | Ash | I think Ash has had enough relativity for the moment.... | |
| Sep 20, 2020 at 17:07 | comment | added | JBH | @JustinThymetheSecond That's a good point, and hopefully something that Ash will expand on in his answer. ("It's impractical to be accurate to the minute because of the following hard-science reasons....") | |
| Sep 20, 2020 at 17:05 | comment | added | Justin Thyme the Second | @JBH The Twin Gorges dam accumulating a discrepancy of one leap second in 54 years, and you are talking about an error correction over thousands of yars? Seems to me, just the water behind the dam would put you off by one minute in 540 years, the accuracy that you are looking for. | |
| Sep 20, 2020 at 16:53 | comment | added | JBH | However, once again, I expressed in the question the fact that whatever drives my ships is to be ignored. It's been educational (given that I recently posted a meta question about dealing with back stories) watching how people just can't let go of things. | |
| Sep 20, 2020 at 16:50 | comment | added | JBH | Ash, yours is to date the only serious answer. Part of the point of asking the question was helping users understand the challenges involving a universal time system. Completely secondary is the fact that a "galactic empire" is almost meaningless unless there's a fundamental change in how we understand physics because an argument could be made that no information is so valuable that you must know it at only the speed of light over interstellar distances. In some cases, even at interplanetary distances (an idea that was used successfully in the movie The Martian). | |
| Sep 20, 2020 at 16:48 | comment | added | JBH | @JustinThymetheSecond Unless the asteroids and meteors are something of the size of the moon - they're irrelevant. I'm not interested in time calculations to the femtosecond or worse region. | |
| Sep 20, 2020 at 16:45 | comment | added | Justin Thyme the Second | The game show contestants on Planet Z, several hundred light years more distant, as the crow flies, from Planet B is from Planet A, would not even understand the question. To them, the event has not yet occured on Planet A, because the information has not reached them. That is, if the information has not reached them, to them it has not occured. Bummer to be a contestant on Planet Z. | |
| Sep 20, 2020 at 14:52 | comment | added | Ash | @JustinThymetheSecond Yeah there would need to be a correction factor for that. It will not be a simple formula. And that mass loss also affects general relativity of the stars - it will be a lot of work to derive. | |
| Sep 20, 2020 at 14:50 | comment | added | Justin Thyme the Second | So THAT is why my watch is off, and why I was late? That damned dam. | |
| Sep 20, 2020 at 14:49 | comment | added | Justin Thyme the Second | But aren't stars continuously changing matter into energy, in some super-hyped method of fusion and fission? As stars form and die, this rate is adjusted. As black holes collapse, huge aounts of energy are released. Calculated over the entire galaxy, that is a lot of mass conversion, methinks. The calibration would need to incorporate some adjustment for the rate of conversion? | |
| Sep 20, 2020 at 14:41 | comment | added | Ash | @JustinThymetheSecond MWBCT would need some calibration, probably not as much as you think. (Stars don't form out of nothing - they came from existing mass, the mass was already there it just changed function). But a calibration will be needed just as we calibrate UTC for events on Earth. NASA scientists calculated that the water stored in the Three Gorges Dam has increased the length of Earth's day by 0.06 microseconds. That's a leap second every 54 years just because of that one dam. | |
| Sep 20, 2020 at 14:37 | comment | added | Justin Thyme the Second | 'Milky Way Barycentric Coordinate Time MWBCT' as stars come into and out of existence, and black holes continuously form, change size, and such, changing matter into energy and energy into mattter, and given that we have no idea how black matter works, isn't this also a constantly changing place? Otherwise, couldn't it be used as the origin in a universal 3D galactic co-ordinate navigation system? | |
| Sep 20, 2020 at 14:27 | comment | added | Justin Thyme the Second | 'And then marvel at the peice of trivia you now know.' Or collect your prize winnings in some intergalactic trivia game like 'Jeopardy' or 'Who Wants to be a Millionaire'. Decisions of the judges are final. | |
| Sep 20, 2020 at 14:20 | comment | added | Justin Thyme the Second | 'have trig and calculus to determine the speed at the exact moment in orbit...' such trig and calculus functions, I presume, based on the Milky Way Barycenter at that precise moment? But a trig function? Wouldn't this be a 3D function? Polar co-ordinates, in a sphere, not a circle? And wouldn't the Solar Systems BaryCentre constantly change, as asteroids come and go into the system? It seems to me that even the Barycentric Coordinate Time would have to be adjusted, as asteroids and meteors approach too close to the earth-moon orbit. | |
| Sep 20, 2020 at 9:00 | history | answered | Ash | CC BY-SA 4.0 |