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Figure 23. Comparison of calculated mean temperatures and observed mean temperatures for the Earth (equatorial inclination, 23.5°).

32°F and 86°F and if the highest mean daily temperature is less than 104°F and the lowest mean daily temperature is higher than 14°F. The results are summarized in Figure 24, which shows the percentage of planetary surface area that is habitable under the above definition as a function of illuminance and inclination.

If a planet must have 10 per cent of its surface in the proper climatic region to be considered habitable, then it may be seen that axial inclinations to approximately 80 degrees are tolerable, and that illuminance

Solid lines: calculated mean temperatures SS = summer solstice E = equinox WS = winter solstice

Points: observed mean temperatures

Summer J Woytinsky and

Winter / Woytinsky, 1953

Solid lines: calculated mean temperatures SS = summer solstice E = equinox WS = winter solstice

Points: observed mean temperatures

Summer J Woytinsky and

Winter / Woytinsky, 1953

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