Orion Arm tech derived Ringworld

[Admiral Valdemar]

On monopoles, anyone heard much more from MoEDAL on their experiments?

[Tom_Kalbfus]

And you think a civilization 10,000 years in the future would know no more about the Universe than we do? Let me put it this way, Dirac was not trying to find a substance out of which a ringworld could be built, Niven was. Perhaps it did not occur to Niven that he could have used a theoretical substance like magmatter rather than making something up out of whole cloth and giving it a name. I think it sounds better to piggyback off of someone else's work than to make something up out of whole cloth for the purposes of a story, I mean if there are trained scientists out there who do this for a living, wouldn't it be better to build a fictional construct out of something they think may exist according to their theory? Yes I know there is no evidence for the existance of magnetic monopoles, but I think an educated guess is better than an uneducated one. I could use flubber for instance, according to the movie flubber powered a sort of reactionless engine which could make a car fly. So in the heirarchy of hard and soft science where do the following substances fit on the totem pole: flubber, scrith, magmatter? Are they all truly equal and can you truly say that it does not matter which ones you use? I could imagine bouncing balls of flubber between two sandwiched plates on the underside of a ringworld, but that sounds silly doesn't it?

Why not? If you are making up unobtainium, you might as well call it unobtainium and not try to couch it in BS. Magnetic monopoles aren't any more realistic than skrith; presumably skrith makes perfect sense to the Ringworld engineers. We don't need to understand it, except that it's strong enough to not be destroyed by the ringworld's rotation.

Incidentally, magnetic monopoles actually appear in Known Space stories as a rare valuable thing; Niven knew about them and it was one of the things he sprinkled into the story to make it sound more science fiction-y. However, for things that the plot of a story may interact with, he just made up suitable material, be it General Products Hulls, Tnuctipun super weapons, skrith, what have you. This is better; because you declared it science fiction you can make up any material you want with any property you want it presume it works. You don't risk anyone going "Hey, wait a minute... this isn't right", beause the thing doesn't exist to be described wrong.

That's always been Orion's Arms problem. You get a bunch of people with pop-sci magazines and books on things like string theory to build stories out of words lifted from said mags/books and then pretend that it's hard stuff. In fact, it's not that much harder than most things, just more pretentious.

Another thing which I forgot to mention is that magnetic monopoles are more generic than "Scrith" which is a substance invented by Larry Niven for his Known Space/Ringworld setting. The ringworld I'm proposing here is not set in Niven's science fiction Universe, I am giving credit where credit is due, it that the ringworld is his concept and it is derived as a cross-section of a Dyson Sphere or Dyson Shell, but just as Star Trek: The Next Generation had an Episode with a Dyson Sphere in it, I wish to use a ringworld in a similar manner without setting it in Niven's Known Space Universe. The one conceit I ask is that you accept that there is a substance which holds the ringworld together, as no normal matter could. (without requiring the mass of a star, despun on the outside of the ringworld pushing inwards.) I think there may well be something 8000 years from now which could be used to hold a ringworld together, for now the place holder will be magmatter as its adequately generic and it indicates that it is a different ringworld from Larry Niven's, its origin is different and it is younger. Nanotechnology was used in its construction, and part of it is made out of normal atoms and part of it isn't. Aside from this one conceit to hold it together, the rest is Hard Science Fiction, nothing exceeds the speed of light and so forth.

The ringworld surface is covered mostly with ocean, and out of the ocean arises continents which were constructed with nanotechnology from a feedstock of elements, rock is created, including fossils, oil, minerals, finally artificial structures and life is created with nanoassemblers from plans deep inside the ringworld's database. Many of the continents hold shapes from Earth's past, life from Earth's past is also represented, the various maps represented on the Ocean are polar projection maps centered on Earth's north pole for a given era represented. One problem is that everything on the ringworld's surface is under a tropical sun that is always directly overhead, to make things cooler at higher similated latitude a heat pump is employed, this is only used for Maps of Earth, the ground is cooled from beneath and that in turn cools the water and then the air affecting the climate and so forth. A lot of continents aren't from any particular Earth Era so they remain as default tropical without any local climate modification. Some humans were constructed with nanotech assemblers, they have memories of past eras from Earth which might not be entirely accurate or reflective of the historic era reconstructed, but there is no way for such beings to know what is historically accurate or not since it is entirely consistent with their own fictional memories, the Earth they remember was very real for them, and then they find themselves on the floor of the ringworld and wonder what to do.

[Tom_Kalbfus]

And you think a civilization 10,000 years in the future would know no more about the Universe than we do? Let me put it this way, Dirac was not trying to find a substance out of which a ringworld could be built, Niven was. Perhaps it did not occur to Niven that he could have used a theoretical substance like magmatter rather than making something up out of whole cloth and giving it a name. I think it sounds better to piggyback off of someone else's work than to make something up out of whole cloth for the purposes of a story, I mean if there are trained scientists out there who do this for a living, wouldn't it be better to build a fictional construct out of something they think may exist according to their theory? Yes I know there is no evidence for the existance of magnetic monopoles, but I think an educated guess is better than an uneducated one. I could use flubber for instance, according to the movie flubber powered a sort of reactionless engine which could make a car fly. So in the heirarchy of hard and soft science where do the following substances fit on the totem pole: flubber, scrith, magmatter? Are they all truly equal and can you truly say that it does not matter which ones you use? I could imagine bouncing balls of flubber between two sandwiched plates on the underside of a ringworld, but that sounds silly doesn't it?

Why not? If you are making up unobtainium, you might as well call it unobtainium and not try to couch it in BS. Magnetic monopoles aren't any more realistic than skrith; presumably skrith makes perfect sense to the Ringworld engineers. We don't need to understand it, except that it's strong enough to not be destroyed by the ringworld's rotation.

It would be a mistake to have the actual characters call it "unobtainium" if only because, for the characters in the story, the stuff is not unobtainable. Now I think it was a big mistake in Avatar to have a mining company uprooting trees to mine a stuff they call "unobtanium" because basically this is an admission on that characters part that it is complete BS and for suspension of disbelief this is not helpful.

Incidentally, magnetic monopoles actually appear in Known Space stories as a rare valuable thing; Niven knew about them and it was one of the things he sprinkled into the story to make it sound more science fiction-y. However, for things that the plot of a story may interact with, he just made up suitable material, be it General Products Hulls, Tnuctipun super weapons, skrith, what have you. This is better; because you declared it science fiction you can make up any material you want with any property you want it presume it works. You don't risk anyone going "Hey, wait a minute... this isn't right", beause the thing doesn't exist to be described wrong.

That's always been Orion's Arms problem. You get a bunch of people with pop-sci magazines and books on things like string theory to build stories out of words lifted from said mags/books and then pretend that it's hard stuff. In fact, it's not that much harder than most things, just more pretentious.

I'm not going to argue with you there, I've received some rather rough treatment from them myself. My main problem is that the OA world is so "alien" and unfamiliar that it is hard to write a story in it. Their unique volcabulary is rather volumnous, and they have special greek or latin terms for various levels of AI programs. I basically did not want to write a story whose main characters are superpowerful AIs in the universe of post-humans and their throwback "pets". The ringworld as I conceive it is a place for creatures like use rather than the uber-powerful AI megamind posthumans that built it, it is rather a nature preserve, and perhaps in part a giant bio-social experiment as well, but the experimenters aren't visible or obvious, they built the place and they they let it run without interference. The setting begins on day zero, where the final touches are placed on the just completed ringworld, people with ficticious memories wake up on its surface, they find a world almost as they remember it, with the main exception of what they see when they look skyward.

[Gil Hamilton]

It would be a mistake to have the actual characters call it "unobtainium" if only because, for the characters in the story, the stuff is not unobtainable. Now I think it was a big mistake in Avatar to have a mining company uprooting trees to mine a stuff they call "unobtanium" because basically this is an admission on that characters part that it is complete BS and for suspension of disbelief this is not helpful.

Unobtainium didn't start with Avatar, it's been a long running joke in science fiction. It acknowledges the fact that science fiction writers can and do just make up stuff all the time, because its alot less silly than slathering something that you just made up in technobabble and try to fool your audience.

I'm not going to argue with you there, I've received some rather rough treatment from them myself. My main problem is that the OA world is so "alien" and unfamiliar that it is hard to write a story in it. Their unique volcabulary is rather volumnous, and they have special greek or latin terms for various levels of AI programs. I basically did not want to write a story whose main characters are superpowerful AIs in the universe of post-humans and their throwback "pets". The ringworld as I conceive it is a place for creatures like use rather than the uber-powerful AI megamind posthumans that built it, it is rather a nature preserve, and perhaps in part a giant bio-social experiment as well, but the experimenters aren't visible or obvious, they built the place and they they let it run without interference. The setting begins on day zero, where the final touches are placed on the just completed ringworld, people with ficticious memories wake up on its surface, they find a world almost as they remember it, with the main exception of what they see when they look skyward.

That's great, but all this doesn't explain why you are bothering taking Niven's Ringworld and added a coat of technobabble to it. The story your describe, with people waking up on a Ringworld, doesn't even need to explain anything about the Ringworld physically. It almost strikes me as better if you don't; the Ringworld has everything it needs to be a good story element without explanation. It's radically different visually than a planet, both from space and from the surface, it's so immense that you have enough room to have anything on it, and mysterious and intriguing an artifact itself.

I just think you should take caution from the OA route. It's not a good thing when you bog a story down in jargon and vocabulary. The story should be central. All those things can exist and you should think about how they interact, but if you start introducing terms that require serious amounts of exposition for them to make sense, that's probably a sign to cut the detail.

An example:
Instead of having shadow squares, you could put the ring around a star that is crazily variable on a predictable 24 hour period, such that it's output varies periodically through out the course of the day like a sine function. It's interesting and certainly could add a fair detail of mystery and wonder to your world, in addition to providing your story with a day and night. It even has a Chekov's Gun element to it; SOMETHING is did that or is doing that to the star.

Now ask yourself in that situation:

Do you REALLY want the explanation to be that a Class Three Post-Singularity Artificial Sophont Sentience is utilizing standard negative mass wormhole arrays (each one exactly -3.45 that of Jupiter) to create a Evanescent Energy Flow System to power the circular landmass simulation system's pico and nanotechnological sub-routine processes to maintain a nitrox templiqH2O environment acceptable to humans and post-humans up to Class Seven, while also providing said sophonts with with both diurnal and nocturnal ambient light situations?

[Samuel]

It would be a mistake to have the actual characters call it "unobtainium" if only because, for the characters in the story, the stuff is not unobtainable. Now I think it was a big mistake in Avatar to have a mining company uprooting trees to mine a stuff they call "unobtanium" because basically this is an admission on that characters part that it is complete BS and for suspension of disbelief this is not helpful.

Why? If something costs as much as unobtainium did in real life, the name would be apt because of how expensive and hard to get it is- after all something you have to travel to another star to get really fits the bill.

[Tom_Kalbfus]

It would be a mistake to have the actual characters call it "unobtainium" if only because, for the characters in the story, the stuff is not unobtainable. Now I think it was a big mistake in Avatar to have a mining company uprooting trees to mine a stuff they call "unobtanium" because basically this is an admission on that characters part that it is complete BS and for suspension of disbelief this is not helpful.

Unobtainium didn't start with Avatar, it's been a long running joke in science fiction. It acknowledges the fact that science fiction writers can and do just make up stuff all the time, because its alot less silly than slathering something that you just made up in technobabble and try to fool your audience.

I'm not going to argue with you there, I've received some rather rough treatment from them myself. My main problem is that the OA world is so "alien" and unfamiliar that it is hard to write a story in it. Their unique volcabulary is rather volumnous, and they have special greek or latin terms for various levels of AI programs. I basically did not want to write a story whose main characters are superpowerful AIs in the universe of post-humans and their throwback "pets". The ringworld as I conceive it is a place for creatures like use rather than the uber-powerful AI megamind posthumans that built it, it is rather a nature preserve, and perhaps in part a giant bio-social experiment as well, but the experimenters aren't visible or obvious, they built the place and they they let it run without interference. The setting begins on day zero, where the final touches are placed on the just completed ringworld, people with ficticious memories wake up on its surface, they find a world almost as they remember it, with the main exception of what they see when they look skyward.

That's great, but all this doesn't explain why you are bothering taking Niven's Ringworld and added a coat of technobabble to it. The story your describe, with people waking up on a Ringworld, doesn't even need to explain anything about the Ringworld physically. It almost strikes me as better if you don't; the Ringworld has everything it needs to be a good story element without explanation. It's radically different visually than a planet, both from space and from the surface, it's so immense that you have enough room to have anything on it, and mysterious and intriguing an artifact itself.

I just think you should take caution from the OA route. It's not a good thing when you bog a story down in jargon and vocabulary. The story should be central. All those things can exist and you should think about how they interact, but if you start introducing terms that require serious amounts of exposition for them to make sense, that's probably a sign to cut the detail.

An example:
Instead of having shadow squares, you could put the ring around a star that is crazily variable on a predictable 24 hour period, such that it's output varies periodically through out the course of the day like a sine function. It's interesting and certainly could add a fair detail of mystery and wonder to your world, in addition to providing your story with a day and night. It even has a Chekov's Gun element to it; SOMETHING is did that or is doing that to the star.

Now ask yourself in that situation:

Do you REALLY want the explanation to be that a Class Three Post-Singularity Artificial Sophont Sentience is utilizing standard negative mass wormhole arrays (each one exactly -3.45 that of Jupiter) to create a Evanescent Energy Flow System to power the circular landmass simulation system's pico and nanotechnological sub-routine processes to maintain a nitrox templiqH2O environment acceptable to humans and post-humans up to Class Seven, while also providing said sophonts with with both diurnal and nocturnal ambient light situations?

I like to have one or two key ideas in science fiction, but otherwise stick with the familiar. I use old-fashioned words such as "alien", "robot", "software", and "computer" using fancy words like sophont, then requires me to then explain the word to the reader because I can't assume he knows its meaning. A ringworld is a very simple construct, hard to build, perhaps even impossible but it is in essence a very simple idea, that is why its attractive to me, I'm also borrowing something from Riverworld, people wake up on the bank of a river or where ever after having lived their lives. Imagine if our world were flatted out and its continents spread out on a polar projection, with the oceans being stretched as the map radiates away from the "north pole", but the continents hold their shape, the cities and the street plans are the same as people remember them, GPS devices don't work as their are no satellites, some of the phones are out of service as they require satellite connections, some TV stations are off the air because their signals are transmitted via satellite, fiber optic cables, phone and cable tv otherwise work fine. Imagine how a society of 6.3 billion people would react to this.

The President is awakened from his bed, but the funny thing though is that he never actually went to sleep, though he remembers doing so. The whole world wakes up in the same time zone, when dawn comes the Sun is at high noon until eclipsed by another shadow square 12 hours later. Some fighter jets are scrambled, flights are cancelled and the nation is put on an emergency footing until the situation can be properly assessed. The President talks with the other world leaders. The NASA administrator is summoned, he confirs with his counterparts in Europe, Japan, Russia,and China. Communication is a little difficult, the underwater cablelines have been stretched to accomodate the larger oceans that come with this polar projection map. Video tapes are reviewed from bank ATMs and the like and the "event" is examined, it appears to be a discontinuity, most witnesses describe a normal sky at one moment and the next there is the "arch" over everything. telescopes are pointed to it and various landforms are identified. The night time constellations are identified, the ringworld appeared to be aligned perfectly along the ecliptic of their formerly remembered world. Geologists taking seimic readings discover there is a floor to the ringworld 2.5 kilometers below sea level, sound waves are echoed back perfectly from it. Weather balloons are released from Cape Canaveral and sounding rockets are launched to take readings from above the atmosphere. The mystery is perverse, no one knows how the world got here, though theories abound.

[Tom_Kalbfus]

It would be a mistake to have the actual characters call it "unobtainium" if only because, for the characters in the story, the stuff is not unobtainable. Now I think it was a big mistake in Avatar to have a mining company uprooting trees to mine a stuff they call "unobtanium" because basically this is an admission on that characters part that it is complete BS and for suspension of disbelief this is not helpful.

Why? If something costs as much as unobtainium did in real life, the name would be apt because of how expensive and hard to get it is- after all something you have to travel to another star to get really fits the bill.

The people of this world don't know how its held together, they woke up and found themselves here surrounded by a world that is at the same time familiar yet strange, the more advanced societies have a better idea than the more primitive ones. Some worlds found in the ocean have no relationship to history, one seems modeled after Middle Earth with humans, elves, dwarves, orcs and the like, no real magic though, another bunch of continents are home to dinosaurs, and beween the clusters of continents are chains of islands. One could sail onward and onward in seeming perpetuity.

[Junghalli]

The premise sounds rather like Charles Stross's Missile Gap, although he used a different kind of megastructure.

[Tom_Kalbfus]

The premise sounds rather like Charles Stross's Missile Gap, although he used a different kind of megastructure.

Yes sounds a lot like the ringworld I'm proposing. There is a map of Earth Circa 2010, and another Map of Earth Circa 1962 and both maps can communicate with each other, Barack Obama will be able to speak with John F. Kennedy via radio telescope, each communicative civilization could establish radio contact with one another, a telescope survey of the ring can reveal other maps of Earth. The main difference between this ringworld and Nivens is that his had maps of different worlds of Known Space on his Great Ocean, this ringworld is mostly ocean and it is littered with maps of Earth from different times, some maps are from historic periods, some from prehistoric and some are entirely fictional. The ringworld has an archive of Earth history, that it draws this information from, many past settings were recreated from this information, some paleotological, that is various dinosaur bones were put together as a basis for designing animals, and then the appropriate DNA sequence is manufactured to grow into those designed animals based on Earth's fossil record.

[Junghalli]

Yes, for a set-up like that an interconnected habitat cluster wouldn't work.

If you want to make your setting scientifically realistic, perhaps consider the possibility that the Ringworld could be a computer simulation. The simulation hypothesis seems to fit decently with your setting thematically, as a powerful civilization screwing with us for their own purposes is already a major plot element, and a simulated world would let you have an impossible structure like a Ringworld without taking any actual liberties with science (best of both worlds!). From the perspective of the simulation's creators, you could probably create a fairly high-resolution simulation of a suitably huge world for a fraction of the effort it would take to actually build one in the real world, even putting aside that (as I said) a computer simulation would let you do things that you couldn't do in the real world (like create a ~1 AU wide Ringworld).

The characters or even the reader need not know this if you don't want them to. From the inhabitants' perspective they just wake up on a construct that seemingly laughs at known material science, and they have no idea how it's possible, but they presume a sufficiently advanced civilization can do it.

A simulation offers the interesting possibilities of the builders occassionally intervening in seemingly magical ways and how the inhabitants would react to this. For instance, anything that emerged from the experiment that was potentially dangerous to them might suffer a spontaneous existence failure from the perspective of somebody inside the simulation (as it would be deleted or frozen out of the simulation). Imagine something simply being there one moment and dissappearing the next, and what a giant WTF this would be to the simulation's inhabitants. Seems to me like there would be some interesting story possibilities there.

[Tom_Kalbfus]

Well actually the ringworld is the simulator, there is a layer of computronium underneath the bedrock and ocean layers. The computronium layer is about 0.5 km thick, it rests upon the superconducting layer and underneath 2.5 km of bedrock and ocean. The computronium layer is the brains and memory of ringworld. The bottom most layer is the superconducting layer which floats on a magnetic field.

[Tom_Kalbfus]

Here is my latest draft describing the ringworld and what's on it, I left out the magmatter this time. Instead we'll have some invisible dark matter of some type, it is not solid to ordinary matter, but it does possess structure among its own particles and the stuff is highly magnetic such that the ringworld's superconducting undersurface levitates off of it. A nonmagnetic spaceship could fly right through it and not even know it was there, it might detect a strong magnetic field seemingly coming from empty space, who knows what sort of particles its made of. A known fact is that 90% of the Universe is composed of dark matter, whatever other properties this dark matter has is anyone's guess. Once we know something more about our universe perhaps we could then fill this "empty space" with something definite, until then the outermost ring will remain mysterious, invisible, and insubstantial to normal matter except where that matter interacts with magnetic fields.

This is a generic ringworld around a Sunlike star which may be our own Sun
sometime in the future.

The physical parameters of this ringworld are as follows:
I. A G2 V yellow star at its center
A. with a diameter of 1,392,000 kilometers
B. a mass of 330,000 times that of Earth or 1.98*10^30 kilograms.

II. The ringworld has the following dimensions
A. 150,000,000 kilometers in radius
B. 1,600,000 kilometers wide from rim wall to rim wall.
C. Both rim walls are 1,600 kilometers in height for retaining the atmosphere on
the inside,

III. The other properties of this ringworld are the following:
A. The ringworld has one Earth gravity of "spin-gravity" at its surface or 9.81
meters per second squared centripetal acceleration.
1. To produce this "gravity" while taking into account the Sun's gravity the
ringworld has
a rotational velocity of 1,213.419 Kilometers per second.
2. This causes the ringworld to rotate once every 8 days, 23 hours, 45 minutes
and 12 seconds. (Almost 9 days)
a. this by ringworlder parlance is defined as a Turn, a Turn equals 9 days
exactly, this is when the constellations in the ringworld sky does a complete
rotation.
b. The ringworld year is 360 days long and is divided evenly into 40 ringworld
Turns, it is more a matter of convenience for the ringworld inhabitants than a
measure of any physical cycle, because humans are used to measuring things in
years. A month is exactly 30 days, most of ringworld is seasonless except for
the maps of Earth where the subsurface is artificially cooled and follows a 360
cycle of winter, spring, summer, and fall with each season lasting 10 ringworld
Turns or 90 days.

IV. Shadow squares.
A. The ringworld uses shadow squares to create night on the ringworld surface.
B. 8 shadow squares rotate retrograte, that is in the opposite direction of the
ringworld's spin, producing the standard 24 hour ringworld day, 12 of those
hours are spend under the shadow of one of the 8 shadow squares.
C. The 8 shadow squares are spaced evenly in a circular orbit around Sun at a
distance of 50,982,312 kilometers this orbit takes 72 days, 15 hours, 56
minutes, and 12 seconds to complete, this rotation would causes the ringworld to
pass under 9 shadow squares in exactly 9 days, that is all 8 shadow squares plus
the first one a second time.

V. The World as we know it.
A. The World as we know it is reproduced on a flat North Pole projection with
the projection distortions reserved for the Oceans rather than the land masses
and with Antarctica positioned off the nearest other landmass of South America.
The North Pole and Antarctical are artificially cooled by underground heat pumps
which draw away heat from these landmasses and redistribute that heat elsewhere
throughout the ringworld subsurface.
B. The World is reproduced as of today July 14, 2010 AD, the ISOT occurs at
midnight in all time zones, and all of the World appears on the ringworld
surface while Sun is eclipsed by a shadow square such that when 6:00 A.M. occurs
in all time zones the Sun suddenly appears from behind a shadow square for 12
hours of daylight.
C. This map of Earth is not the only one that appears on the ringworld surface,
there are thousands of others. The following dates are from historic periods
spread throughout the ringworld surface on "Day 0":
Maximum Latitude 0 deg. 18' 20" North or South (727.2205217 km per 1")
Just a note on a ringworld Map, the position of the north pole on Earth Map 2010
is defined as the prime meridian by common concent of all communicating historic
Earth Maps, the locations defined are the positions of the north poles of each
Earth Map.
A further note about directions on a ringworld map the compass points are
defined thus:
-N
E-W
-S
With East defined as the spinward direction of ringworld and West defined as
antispinward in L. Niven parlance.

1. 2010 July 14 Wednesday: 9' 18" North, 0 deg. 0' 0" West
2. 1970 January 24 Saturday: 10' 57" North, 42 deg. 5' 33" West
3. 1947 March 4 Tuesday: 16' 7" South, 31 deg. 19' 4" West
4. 1907 January 24 Thursday: 11' 30" North, 108 deg. 48' 33" West
5. 1983 November 11 Friday: 6' 53" North, 74 deg. 23' 26" East
6. 2001 October 6 Saturday: 6' 19" South, 72 deg. 36' 54" East
7. 1964 March 19 Thursday: 17' 32" South, 47 deg. 56' 31" East
8. 2003 November 27 Thursday: 3' 42" North, 68 deg. 46' 13" East
9. 1978 May 7 Sunday: 9' 4" North, 143 deg. 37' 6" East
10. 1908 March 24 Tuesday: 12' 28" North, 6 deg. 59' 14" West
11. 1999 January 3 Sunday: 13' 8" North, 103 deg. 1' 58" East
12. 1955 February 26 Saturday: 9' 6" North, 127 deg. 59' 5" East
13. 1929 November 11 Monday: 5' 30" South, 119 deg. 24' 58" West
14. 1991 May 13 Sunday: 13' 17" North, 52 deg. 26' 4" East
15. 1995 July 10 Monday: 11' 22" North, 70 deg. 41' 0" East
16. 1933 May 4 Thursday: 9' 3" South, 93 deg 19' 25" East
17. 1922 November 15 Wednesday: 3' 44" North, 93 deg. 35' 15" West
18. 1932 July 23 Saturday: 12' 6" North, 155 deg 48' 23" West
19. 1926 March 1 Monday: 14' 23" North, 87 deg. 39' 34" West
20. 1902 December 5 Friday: 2' 30" South, 132 deg. 20' 9" East
21. 1926 October 10 Sunday: 12' 34" North, 80 deg. 5' 49" East
22. 1943 January 19 Monday: 10' 38" North, 21 deg. 17' 35" West

There are lots of other Earth Maps on the ringworld surface but they are not
communicating via radio, so its hard to tell what dates they are from,
presumable from some year in the past. Some other Earth Maps are of deep time,
their eras are revealed by their continental configurations, there are about
100,000 of these representing eras ranging from 500 million years ago to
approximately 10,000 BC. The closest to Earth Map 2010 are the following:

392.16 MYA: 13' 13" South, 0 deg. 0' 15" West
8.07 MYA: 13' 24" North, 0 deg. 0' 6" East
245.14 MYA: 16' 35" South, 0 deg. 0 ' 14" East
110.97 MYA: 12' 42" South, 0 deg. 0 ' 11" East
67.36 MYA: 8' 37" South, 0 deg. 0' 13" West
383.34 MYA: 3' 33" South, 0 deg. 0 ' 15" East
263.63 MYA: 15' 51" South, 0 deg. 0' 17" West
270.6 MYA: 11' 11" North, 0 deg. 0' 23" East
8.25 MYA: 15' 37" North, 0 deg. 0' 30" East
75.23 MYA: 14' 11" North, 0 deg. 0' 20" East
362.03 MYA: 13' 23" South, 0 deg. 0' 34" East
178.38 MYA: 16' 35" South, 0 deg. 0' 31" East
175.07 MYA: 4' 34" South, 0 deg. 0' 19" West
498.84 MYA: 3' 39" South, 0 deg. 0' 28" West
129.73 MYA: 3' 56" South, 0 deg. 0' 19" East
151.6 MYA: 10' 52" North, 0 deg. 0' 17" West
21.32 MYA: 3' 16" South, 0 deg. 0' 20" West
357.71 MYA: 10' 16" North, 0 deg. 0' 20" East

In addition to the above there are 20 Earth Maps that represent Earths or other
Worlds that never were, apparently taken out of literature or fiction, these are
either revealed by radio transmissions or obvious continental configurations:

Among those are the following:
1. Tolkein's "Middle Earth": 5' 50" North, 161 deg. West
2. George Orwell's "1984": 17' 7" South, 107 deg. East
3. Huxley's "Brave New World": 13' 31" South, 109 deg. East
4. Turtledove's "TL 191 circa 1941 April 5 Saturday": 11' 37" North, 90 deg.
East
5. Frank Herbert's "Dune/Arakis": 8' 45" South, 81 deg. West
6. Anne McCaffrey's "Pern": 11' 24" South, 167 deg. 48' 43" West
7. Terraformed Venus: 17' 7" North, 63 deg. 16' 47" West
8. "Toril" from D&D's Forgotten Realms: 10' 41" South, 125 deg. 25' 25" East
9. "Looking Glass Earth": 10' 35" South, 54 deg. 33' 7" West
10. "Coruscant" from Star Wars: 12' 1" South, 46 deg. 32' 40" East
11. "Vulcan" from Star Trek: 2' 23" South, 132 deg. 58' 33" West