Here's a green flash I photographed a few years ago at ESO's Paranal Observatory in Chile, back when I worked there. This phenomenon happens at sunset or sunrise if conditions are right, especially if the atmosphere is strongly layered.

This is a rapid burst of shots taken one after the other. The whole sequence lasted only two seconds, which gives you an idea of how ephemeral green flashes are.

#astrodon #astronomy #astrophotography #sunset