Regarding Fernando Cabral's multiple observation of sunsets at one setting I recently wrote to the "Marine Observer" (British Met. Office) concerning a meteorologist who claimed to have seen the sunset green flash three times at one setting by climbing to successive decks of an ocean weather ship as the sun sank. This elicitated the following note to the same journal (Marine Observer, April 1999) from Dr. R. J. Livesey, Director of the Aurora Section, British Astronomical Association, whose text I acknowledge:
"I was in Holyrood Park, Edinburgh, on the lower slopes of Arthur's Seat with a good clear sky. The sun was setting behind the top of David Hume tower block of Edinburgh University, which is about a mile away, when I saw a green flash. Realising the geometry of the situation I ran back up the slope until the sun was again visible above the tower block. Again as it set behind the building there was a green flash. I was able to repeat the phenomenon by a second run up the slope. One was required to move only so much as would bring the upper limb of the sun just above the tower block to cause a repeat as the sun sank down." -- Frank Evans
