|A few depictions of the habitable zone, or just right temperature regions, in which carbon-based, e.g. retinal, or CHNOPS-based intelligent animate matter, e.g. humans, can exist.|
In 1585, Giordano Bruno, in his On the Infinite, the Universe, and the Worlds, posited that there were many suns with many planets and that those not too cold or not too hot would be "inhabited", although, to note, he did not get into specifics about zones.
In 1974, Henry Swan vicariously defined the habitable zone as a medium powered region, as follows: 
“Biosphere: region of energy-supplied liquid water existing terrestrial surface, encompassing steady-state organizations of CHNOPS matrix forms.”
In 2006, Paul Davies, in his The Goldilocks Enigma: Why Is the Universe Just Right for Life?, argues that pictured below;
in which he argues that the earth, with its so-called "bio-friendly" conditions habitable zone (Ѻ) , was fine-tuned by accident, and found in one of many universes.
1. Swan, Henry. (1974). Thermoregulation and Bioenergetics: Patterns for Vertebrate Survival (CHNOPS, 9+ pgs; biochemistry, pg. 2). American Elsevier Pub. Co.
● Circumstellar habitable zone – Wikipedia.