How to broadcast Earth's position to someone in the future?
Using current technology, what could I do to optimize the odds of being located by time-traveling humans a thousand years from now? The accuracy must be such that they could "transport" me out of a 10-meter box at a specific date and time, within a 60-second window. Oh, and to minimize the butterfly effect, all interaction must take place inside the 10-meter box. No search parties walking or flying around and disturbing the timeline; they must beam in and beam out of that box!
Here are my ideas:
To find Earth's rough location, I'm wondering if I could send a radio signal, perhaps from multiple towers. A cloaked ship in the region could zero in on the signal? Would this even be necessary? A civilization capable of time travel could surely calculate Earth's flight path, or am I underestimating the difficulty?
Also GPS coordinates may not be meaningful to folks 1000 years from now, so use planetary alignments. Schedule the extraction on Hawaii, when the sun is directly overhead. This is known as Lahaina noon and occurs once a year, when telephone poles cast no shadows (provided they are perpendicular). This ensures that the extraction point is precisely aligned with the center of the Earth and the center of the Sun.
BTW, I'm able to write instructions to the future time travelers (digital or hard-copy), e.g. "look for the big island" or "I'm the bald guy in the blue shirt."
EDIT: Here's the synopsis:
Tom, my modern-day protagonist, has a fiancee who has either been kidnapped into the future, or incinerated. Since Tom has no time machine, he must create an organization that will endure long enough for a time machine to be built that can come back and rescue her. The sole purpose of this organization is to survive political upheaval, collapse of civilization and even destruction of Earth, and to ensure that a time machine will be built to come back and rescue his fiancee (OK that's two purposes).
Using this organization, Tom will pass along information relevant to the rescue, e.g. dates, locations, maps, etc. Chances are, this info will be sufficient to locate his fiancee, but he wants to increase the odds.
This post was sourced from https://worldbuilding.stackexchange.com/q/128614. It is licensed under CC BY-SA 4.0.
1 answer
Are you able to send graphics? Or print them. If GPS coordinates may not be meaningful in 1000 years, why assume that your use of English will be? (Or any current language) If they can find the earth itself and if they can make use of an instruction such as "look for the big island" then they could use a map. A full set of maps would be my preference. One of the earth. Then the ocean region. Then the Hawaiian islands. Then the area. Town. Neighborhood. Building. Floor/location in building. Or cave. Or underground. Wherever you plan to hang out for 1000 years.
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