Astronomy Picture of the Day . A Green Flash from the Sun . ... It's a green flash from the Sun . ... A dramatic green flash , as well as an even more rare blue flash , was caught in the above photograph recently observed during a sunset visible from Teide Observatory at Tenerife , Cannary Islands , Spain . ... NASA Official: Jay Norris. ... Publications with keywords: green flash - blue flash - Sun - refraction . Publications with words: green flash - blue flash - Sun - refraction . ...