- #71
Mike_Fontenot
- 249
- 17
phyti said:But what if ships 1 and 2 do not synchronize their clocks upon leaving earth?
What would they conclude about the message?
Irrelevant to the above discussion.
phyti said:But what if ships 1 and 2 do not synchronize their clocks upon leaving earth?
What would they conclude about the message?
Buckethead said:But in an earlier post you said the returning ship would see the Earth as being 4 times as far away as the leaving ship. Doesn't this mean the returning ship would see the Earth as being twice as far as a ship in the same location that is not moving relative to the Earth?
Mike_Fontenot said:Irrelevant to the above discussion.
sylas said:Yes, it does.
These are not illusions. .
phyti said:Yes they are because of the simultaneity and synchronization definitions.
The absolute propagation speed c is sustituted for the relative (closing) speed of light.
1905 paper, par 1 & 2.
ghwellsjr said:The only problem is you have the two ships racing toward each other when I think you want them racing away from each other (and from the earth) but otherwise this is no different than the first half of the Twin Paradox.
The answer to your problem is that it is impossible to sync their clocks unambiguously if they are not in the same location. Earth and the ships will not agree on the exact time at which the others "synced" their clocks, they will all say that the others pushed their triggers too early or too late. If Earth observes the two ships pressing their sync triggers simultaneously, each ship will say the other pressed it a lot earlier (if moving towards each other) or later (if moving away from each other).John232 said:I don't see how direction of motion is a issue. But, yes it is just the first half of the Twin Paradox. Say, the ships went close enough to the speed of light they aged 3 times slower.
Three Earth secounds goes by, Earth reads each clock on each ship to only have read 1 secound. Each ship reads his clock to have read 3 secounds, and Earth and the other ship 1 secound. They all try to sync their clocks to read the same time. How is this possible if they all read different times on each others clocks?