On Earth, the solar radiation varies with the angle of the Sun above the horizon, with longer sunlight duration at high latitudes during summer, varying to no sunlight at all in winter near the pertinent pole. When the direct radiation is not blocked by clouds, it is experienced as sunshine. The warming of the ground (and other objects) depends on the absorption of the electromagnetic radiation in the form of heat.
William was traveling in a boat on the Pacific Ocean in the Northern Hemisphere during the summer and got lost at sea when his boat malfunctioned. None of his navigational equipment works and William isn't quite sure where he is or in what direction he is heading. William is trying to determine whether he is moving north or south based on the length of sunlight duration. On Day 1, William recorded 13 hours of sunlight and on Day 45, William recorded 9 hours of sunlight.
Is it least likely that William is moving north or south?