Ozone: Twilit Skies, and (Exo)planet Transits: Figure_5

An image of a sliver of direct sunlight photographed from the International Space Station [ISS015-E-10471, 3 June 2007, courtesy of NASA]. This illustrates the colour of the light source that illuminates the eclipsed Moon at the boundary between the umbra and penumbra of the Earth’s
shadow (see Figure 4). We note that the darker, dirty yellow band dividing the troposphere from the stratosphere corresponds to the region of maximum ozone absorption and so demonstrates that the Chappuis band is visible without the use of a spectrometer!

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