if we omit the visual experience, sunset / sunrise is a story (specifically movement). therefore, it is not possible to determine in one direction in which direction the sun is moving on the horizon, similarly to the photograph of pendulum clocks, we cannot determine in which direction the pendulum or clock hands move - although we know (from experience) which direction the hands move (but about pendulum we can't say that). nevertheless, we can (but do not have to) judge from the country whether it is east / west - for example, if there are flocks of birds flying in the picture, it is west (birds fly to a dormitory, birds do not fly away at sunrise). therefore, in order to know the story, we need at least two images at a reasonable time interval, so that we can determine, among other things, the direction of movement (we can also find out, for example, speed or trajectory). (tuxedo)