![Footnote: Projected mid-section trajectory of the sunbeam that reaches the lunar disk targeted by the telescope at 21:36UT on 16 August 2008. Overplotted, the SO2 cloud (a usual volcanic cloud tracer) on 15, 16 and 17 August (red, green and blue, respecti Footnote: Projected mid-section trajectory of the sunbeam that reaches the lunar disk targeted by the telescope at 21:36UT on 16 August 2008. Overplotted, the SO2 cloud (a usual volcanic cloud tracer) on 15, 16 and 17 August (red, green and blue, respecti](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados80_83.jpg?itok=1yemqRjX)
The Moon's changeable aspect during a lunar eclipse is largely attributable to variations in the refracted unscattered sunlight absorbed by the terrestrial atmosphere that occur as the satellite crosses the Earth's shadow. The contribution to the Moon's aspect from sunlight scattered at the Earth's terminator is generally deemed minor. However, our analysis of a published spectrum of the 16 August 2008 lunar eclipse shows that diffuse sunlight is a major component of the measured spectrum at wavelengths shorter than 600 nm. The conclusion is supported by two distinct features, namely the
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