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Regarding Primordial Systems rules (p.226), is it safe to say that any terrestrial world or moon in a system that is less than 1 million years old will always be Size 0 or S? Is there a bias toward 0 or S in that regard? (My current binary system - O3 V primary with a B4 V close companion - has...

With low rolls on both composition and density, even an E world could have a gravity in the .7-.9 range (for a +1 Hab); the size also gives a +1 Hab, both of which would compensate for the -2 Hab from the tainted atmosphere. Hydro in a no penalty zone and a temperate climate would give you a 10...

I'm trying to decide between two worlds as the Mainworld for one of my systems. One is SAH = 696, with an H.7.8 taint, RR 7, and Hab 7. The other is SAH = CD9, with an H.6.8 taint, RR C, and Hab 5. Neither world has native sophonts. I'm split between the two (696 has a deadlier High O2 taint...

For the record, I only populate more detailed information (i.e., gravity, mass) for moons of Size 2 and larger. It's possible a Size 1 or S moon close to the parent world will have enough of a measurable effect on the world's rotation, but I have over 200 systems to build for my new pocket...

So, I was looking at hierarchies of tidal locks, and, after reading a little on the relative strengths of tidal pulls (in our case, Sol vs. Luna), I've devised a way to quantify relative pulls for determining the order of checking for the world's tidal lock. Here's what I wrote up for my own...

Got it. Thanks! (I'm sure I'll be back...)

And, just to pile on, is it a safe assumption (at the very least for the sake of simplicity), that when a terrestrial world and a moon are in a mutual 1:1 tidal lock, the moon's orbital period (and, thus, its rotational period) is changed to be equal to the parent world's rotational period?

Thanks for the clarification. I went with a DM+8 for G & H atmospheres to reflect that they start at an order of magnitude more oppressive than even extremely dense insidious atmospheres. I noticed today on p.105, a note on the Tidal Lock Status chart says to reroll an axial tilt of more than 3...

Question on modifiers for the Habitable Zones Regions chart on p.47 (pdf p.48): What DMs should we set for atmospheres G and H? I have a Size E world (a moon of a gas giant) in the HZCO +3.01 zone that ended up with an atmosphere of H. (I figured the atmospheric pressure at just over 2,000 bar.)...

Since I picked up the book, I've been using a spreadsheet to handle a limited number of calculations (i.e., those that don't rely heavily on dice rolls), using a Google doc to record each system's information...not sure I'm going to have any space on my Google Drive when I finish system number...

No worries. Having had to self-edit my first novel, I understand how tedious it can be, especially with what amounts to a highly-technical manuscript. I'm glad the formula is what's correct. :) And, I think the final solution to the formula works well, including the inverse probability of high...

First of all, I'm loving this book. It has all the crunchy bits I've been wanting for my Pocket Empires campaign. On p.131, the native lifeforms Compatibility Rating is expressed as 2D - (Biocomplexity Rating/2) + DMs However, the Zed Prime example use a biocomplexity of 5, a DM+2, and a +3...