Note the ratio of the two areas. Common assumptions for this ratio are ⁠ 1 / 4 ⁠ for a rapidly rotating body and ⁠ 1 / 2 ⁠ for a slowly rotating body, or a tidally locked body on the sunlit side. This ratio would be 1 for the subsolar point, the point on the planet directly below the sun and gives the maximum temperature of the planet — a factor of √ 2 (1.414) greater than the effective temperature of a rapidly rotating planet.