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Galactic and Universal Time
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<blockquote data-quote="MODAT7" data-source="post: 257590" data-attributes="member: 13649"><p>Given time dilation problems caused by velocity and gravity, this is an unsolvable problem. If you think planet to planet communications are bad, just wait until you try starship to starship.</p><p></p><p>Epoch Time is just a convenient choice to start counting at some rate at some event. A new Epoch Time could be started just as easily when some hypernova detonated in the galaxy. From there some method of counting could be started based on a round number of ticks from an atomic clock. For best results, this new "time beacon" for the galaxy should be in deep space away from any gravity wells. There's still the problem that the galaxy is moving through the universe, the arms of the galaxy are spinning in a kind of orbit, the local stars bobbing up and down in the galactic arms, planets are orbiting stars, and planets are rotating (often with moons). Maybe a time beacon out in the void between galaxies would be better.</p><p></p><p>Ein just mentioned universal expansion. There may need to be more than one time beacon so this movement could be accounted for. A whole bunch of time beacons could be used as a kind of galactic GPS.</p><p></p><p>This is still of the assumption that FTL communications are possible and practical. The next question is: how fast are those communications? At 2c, that's a 100% increase over our 1c, but it is still painfully slow... even at the solar system level. In Trek terms, subspace communications are near instant... depending on who's doing the writing. If subspace communications really were point to point instant regardless of distance, a time beacon between galaxies would be practical. If subspace communications are significantly FTL but it still takes years to get across the galaxy, then a time beacon would be of limited use.</p><p></p><p>I've heard some speculate that time travelers might use planetary alignments as a type of clock when time travelling within a solar system. It isn't "to the second" accurate, but it is easy to see when to come back to normal space... at least in theory.</p></blockquote><p></p>
[QUOTE="MODAT7, post: 257590, member: 13649"] Given time dilation problems caused by velocity and gravity, this is an unsolvable problem. If you think planet to planet communications are bad, just wait until you try starship to starship. Epoch Time is just a convenient choice to start counting at some rate at some event. A new Epoch Time could be started just as easily when some hypernova detonated in the galaxy. From there some method of counting could be started based on a round number of ticks from an atomic clock. For best results, this new "time beacon" for the galaxy should be in deep space away from any gravity wells. There's still the problem that the galaxy is moving through the universe, the arms of the galaxy are spinning in a kind of orbit, the local stars bobbing up and down in the galactic arms, planets are orbiting stars, and planets are rotating (often with moons). Maybe a time beacon out in the void between galaxies would be better. Ein just mentioned universal expansion. There may need to be more than one time beacon so this movement could be accounted for. A whole bunch of time beacons could be used as a kind of galactic GPS. This is still of the assumption that FTL communications are possible and practical. The next question is: how fast are those communications? At 2c, that's a 100% increase over our 1c, but it is still painfully slow... even at the solar system level. In Trek terms, subspace communications are near instant... depending on who's doing the writing. If subspace communications really were point to point instant regardless of distance, a time beacon between galaxies would be practical. If subspace communications are significantly FTL but it still takes years to get across the galaxy, then a time beacon would be of limited use. I've heard some speculate that time travelers might use planetary alignments as a type of clock when time travelling within a solar system. It isn't "to the second" accurate, but it is easy to see when to come back to normal space... at least in theory. [/QUOTE]
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