The albedo of a surface is the fraction of the sunlight falling on it that it reflects, a number between 0 (all the light absorbed) and 1 (all of it reflected). The Bond albedo of Chapter 2 is the albedo of a planet taken as a whole.
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Example 3.8 (The sunlight the Earth absorbs)
With a Bond albedo of 0.294, each square metre absorbs on average . Over the whole sphere, of area , the Earth absorbs of sunlight: this power drives the winds, the ocean currents and the water cycle.