I was looking at my pictures taken taken during my vacation at the Belgian Coast @De Panne. On July 18th I was able to take a picture of Green Flash -
see my blog but also on July 17th. When looking at the details of the those pictures I saw aswell a Green Flash. This time the flash was observed a little above the horizon. The Green Flash on July 18th was a little higher above the horizon.
To conclude: I was able to photograph twice a Green Flash during my holliday. Really Cool!