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Message: <blockquote data-quote="Nyeshet" data-source="post: 2339346" data-attributes="member: 18363">Here are some links that might be of interest to you: Stars and Habitable Planets<a href="http://www.solstation.com/habitable.htm" target="_blank">http://www.solstation.com/habitable.htm</a>Twin Earths: An Inquiry into the Posibility of Binary Habitable Planets*<a href="http://www.jabpage.org/posts/twnearth.html" target="_blank">http://www.jabpage.org/posts/twnearth.html</a>* You can guess how complex / 'interesting' my homebrew world is, ne? ^^Planet Designer **<a href="http://www.planetdesigner.org.uk/" target="_blank">http://www.planetdesigner.org.uk/</a>** Remember to set the moon(s) distances (relative to their planet) in AUs!! It used to take km, until he modified the form to deal with binary planets a couple years ago. I still have mixed feelings about the change. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f621.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":mad:" title="Mad    :mad:"  data-smilie="4"data-shortname=":mad:" /> Its lack of recognition for more than a few points after the decimal also increases the difficulty of this unless you use scientific notation.<a href="http://www.bumply.com/astro.html" target="_blank">http://www.bumply.com/astro.html</a>This link is useful to collaborate with the above link. Some differences - sometimes notable: such as habitable zones for stars; one uses mass, one uses apparent luminosity for the planetary distance, and the two sites agree only if you manage to compute the apparent luminosity very very finely before you input it. That the Planet Designer seems to have a low threshold for places after the decimal place means I often use this link instead for things like Habitable Zones. Star Gen (builds solar systems, but entirely random)<a href="http://fast-times.eldacur.com/StarGen/RunStarGen.html" target="_blank">http://fast-times.eldacur.com/StarGen/RunStarGen.html</a>World Builders (good for the basics, an actual college couse in LA)<a href="http://curriculum.calstatela.edu/courses/builders/index.html" target="_blank">http://curriculum.calstatela.edu/courses/builders/index.html</a>- - -These might also be of interest to you: Medieval Demographics Made Easy (based on historical tax records, mostly from france during the late middle ages, IIRC)<a href="http://www.io.com/~sjohn/demog.htm" target="_blank">http://www.io.com/~sjohn/demog.htm</a>Population Center Demographic Calculator (another version of the prior, with D&D racial breakdown)<a href="http://www.lucidphoenix.com/dnd/demo/business0.asp" target="_blank">http://www.lucidphoenix.com/dnd/demo/business0.asp</a>Kingdom Populator (uses the above link to produce stats for an entire kingdom! )<a href="http://www.lucidphoenix.com/dnd/demo/kingdom.asp" target="_blank">http://www.lucidphoenix.com/dnd/demo/kingdom.asp</a>- - -Oh, if anyone is interested, the world I'm working on is larger than earth (r=11262 km), but has about the same land mass. Its a binary planet - each with a moon - circling an F3 type star (~1.29 solar masses) which has a very small, very distant companion red dwarf (~180 to 200 AUs away, IIRC). The binary planet itself is around 1.68 AUs, but since the star has a habitable zone of 1.47 to 2.15 AU that's not really a problem. The larger world is a bit over three earth masses, while the smaller world (about half the radius of the larger) is about three-quarters the earth's mass. Nearly all of the land is in the northern hemisphere, focused into three main continents that will likely become a pangaea mass continent sometime in the next 50-100 million years. The other planet is not yet developed as a concept (beyond the fact it is habitable). The moons are both smaller and much less massive than the earth's moon - more like exceedingly large captured asteriods, really, just large enough from the ground not to be confused with stars. They're the only unrealistic point, so far. I expect the only reason they're still in orbit (not tossed out of it) is due to divine intervention. Perhaps another divine intervention necessity: I'm still not sure if the main world (nearly eightfold earth's surface area and only just over threefold its mass) is feasible. I don't want a hollow world, but perhaps a world with less iron / heavy metals at its core would be a reasonable explanation, perhaps. No posted maps yet. I'm still determining ocean current patterns, basic wind patterns, and plate techtonics (so I can be sure I have the mountains right). I have ideas for the cultures that will later form and the histories of their peoples, but for now I'm still working on its geologic past and its realism. I'm thinking that perhaps elves and humans developed on different continents. Wild magic exists, so perhaps a small tribe of human precursors was somehow shunted to the other continent in ages past and developed along different lines. Once in a million years doesn't seem to unlikely for so massive a surge, I think . . . . I'm still creating the magic system, however, so I'm not yet sure how realistic this idea is yet.</blockquote>

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