Warren Thompson is one of the best known demographers, having created his own model of the demographic transition in the societies. Thompson studied carefully and in detail the information he had available about the mortality and the birth rates from a period of around 200 years. Based on the information he gathered and analyzed, Thompson managed to come to certain conclusions about the mortality and birth rates in the industrialized societies thus make his own theory about it.
minute of arc, arcminute, arc minute, or minute arc is a unit of angular measurement equal to of one degree. Since one degree is of a turn, one minute of arc is of a turn
