Green Flash observed on the western horizon from Madagascar as the eclipse ends. Visible over the Mozambique Channel the sun set just minutes from 4th contact.
Green flash is an atmospheric phenomenon observed AFTER the Sun has actually set. The Sun's light enters Earth's atmosphere, refracting towards the observer. Red light has longer wavelengths and refracts less than blue....
Therefore, Red light disappears first from the disk, leaving orange, yellow, green - but blue disperses and is scattered into the atmosphere - leaving GREEN as the last glimpse of light remaining.
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All Text / Photographs / Graphics (C)2001 Vic & Jen Winter/ ICSTARS Astronomy, Inc.