Countries to the north and south of the tropics, see sunrise much earlier and sunsets much later in summer, than these regions do in winter. On most farms, this isn't a problem. People and animals just shift their habits as the hours of daylight shift. In most cities, the amount of energy used to make artificial light and heat becomes costly, if they don't shift their routines. This is where William Willett, the godfather of Daylight Savings comes in.