Can some Second Survey data can be considered canon in other eras? Census data all goes to pot, sure, during 7000+ years of human habitation. But what about physical data (Stars, planet size, atmosphere, hydrographics)? I ask because I am developing Map data in other eras past and future for my own use. I would like to specifically restrict the discussion to the OTU and try to keep data as canon as possible.
Eras future to Second Survey seem easy enough. Planet data gets modified appropriately due to Rebellion, Hard Times, New Era and 1248 using the rules from various books. So there hex locations and planet sizes and stars would stay the same. Maybe atmosphere or hydrographics stay the same (assuming no Black War or New Era changes or terraforming being undone).
For eras in the past, would the hex locations and mainworlds be applicable? I would think that except for tech level reasons, economics (ex. The Long Night) or colonization rationale (Terran and Vilani in GURPS Interstellar Wars), most planets of interest to the Third Imperium were of interest to be inhabited or reinhabited for exploitation by human empires going all the way back to the the Ziru Sirka or Zhodani. The hex locations, planet sizes and stars reflected in Second Survey should still be applicable. Or is this a wrong assumption?
Finally, due to the Secrets of the Ancients campaign, I am trying to develop some star map data for the Ancient's period before the Ancient's War. I making a homebrew for Droyne habitation using the Alien Module. Planets of interest would be worlds that in Second Survey have Ancient's Sites, Droyne or Chirpers and those which would be "Droyne Garden Worlds" (size 3 to 6, atmosphere 6 or 8 (probably 8), hydrosphere 3 +). Would hex positions, planet sizes and stars stay the same at least from a canon standpoint? OTOH from a real life standpoint, it is 300000 years ago and stars do move and so on.
Or are there better assumptions to use for different eras?
Eras future to Second Survey seem easy enough. Planet data gets modified appropriately due to Rebellion, Hard Times, New Era and 1248 using the rules from various books. So there hex locations and planet sizes and stars would stay the same. Maybe atmosphere or hydrographics stay the same (assuming no Black War or New Era changes or terraforming being undone).
For eras in the past, would the hex locations and mainworlds be applicable? I would think that except for tech level reasons, economics (ex. The Long Night) or colonization rationale (Terran and Vilani in GURPS Interstellar Wars), most planets of interest to the Third Imperium were of interest to be inhabited or reinhabited for exploitation by human empires going all the way back to the the Ziru Sirka or Zhodani. The hex locations, planet sizes and stars reflected in Second Survey should still be applicable. Or is this a wrong assumption?
Finally, due to the Secrets of the Ancients campaign, I am trying to develop some star map data for the Ancient's period before the Ancient's War. I making a homebrew for Droyne habitation using the Alien Module. Planets of interest would be worlds that in Second Survey have Ancient's Sites, Droyne or Chirpers and those which would be "Droyne Garden Worlds" (size 3 to 6, atmosphere 6 or 8 (probably 8), hydrosphere 3 +). Would hex positions, planet sizes and stars stay the same at least from a canon standpoint? OTOH from a real life standpoint, it is 300000 years ago and stars do move and so on.
Or are there better assumptions to use for different eras?
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