The human eye could see a candle flame flickering up to 30 miles

Did you know that the human eye is so sensitive that could spot a candle flame flickering up to 30 miles (48 km) away, assuming the Earth was completely flat and dark?It is really impressive, especially if we take into account that the approximate field of view of an individual human eye is 95° away from the nose, 75° downward, 60° toward the nose, and 60° upward, allowing humans to have an almost 180-degree forward-facing horizontal field of view.