Quote:
Originally Posted by Agemegos
Since permanent human settlement requires (a) photosynthetically active illumination, (b) an excess of precipitation over potential evaporation, and (c) an average temperature between 273 K and 303 K it seems to me that the habitation candidates among synchronously rotating planets are not those that are about as warm as Earth (settled in the twilight zone), but those that are on average a little cooler than Earth, which will be settled in the subsolar region where it rains and where the light is brighter.
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Does that mean that there'd be a gradient of habitable worlds, with a habitable band located anywhere from the subsolar point to the twilight zone, depending on their average temperature (and hydro load, etc.)? Or is there absolutely going to be an arid band around the subsolar pole?