In the evening twilight of the World Heritage Banff National Park in Alberta, Canada, the Full Moon rises over Mount Rundle and Vermilion Lakes. Note the pinkish glow or antitwilight band that extends the horizon. The glow is separated from the horizon by a dark layer which is the shadow of Earth in the atmosphere. The pink color above it is due to back scattering of reddened light from the setting Sun and is named the Belt of Venus.



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