To a photographer, a few seconds of error in sunset time is the difference between an awesome sunset with oranges, reds and purples, versus an uninspiring mass

To a photographer, a few seconds of error in sunset time is the difference between an awesome sunset with oranges, reds and purples, versus an uninspiring mass of grey clouds. Of course a photographer would start well before sunset and continue well after, but if you want to program a machine to photograph su sets you will end up having to use techniques other than checking the time.