Why does it get dark around five o'clock in December?

Answer 1

In Patagonia it does not get dark at five o'clock in December. Indeed the time it gets dark in December is determined by your latitude North or South. The further north you are the earlier it gets dark. This is because the axis of Earth's spin is inclined in respect of the plane in which the Earth orbits the Sun. In December the area round the North pole never gets light.