Savage found that flying was the safest mode of transport with just 0.07 deaths per one billion passenger miles. Conversely, travelling by motorcycle is by far the most dangerous way of getting from A to B, with 212.57 deaths per billion passenger miles travelled
the change between day and night is caused by the rotation of earth on its axis ...the changing of lengths of day and nights depend on where you are on earth and the time of year. also, daylight hours are affected by the tilt of earth's axis and its path around the sun
