There is a phenomena at sunset called the green flash. For 25yrs I have sat at sunset and listened to my family members screaming “there it is” as the sun would drop over the horizon. Having never really seen it myself, I was convinced it was a “single malt” phenomena! So this year I set up the motor drive each night and finally found one that I could see! I guess it does exist. In my series of images, it first appeared at the top of the sun as a small spot and eventually showed at the far edges of the sun. Apparently, this is an optical phenomena that can be observed on clear unobstructed fields, especially across an ocean or from the sky.