The uneven heat of the Sun isn’t the only thing that affects the direction of wind. The rotation of the Earth causes wind to curve, which is known as the Coriolis Effect. This video demonstrates a two-dimensional version of the Coriolis Effect:
The Coriolis Effect causes wind to curve right in the northern hemisphere and to the left in the southern hemisphere, which results in prevailing wind patterns. Because humans like to name things, these winds have names. Trade winds (also known as easterlies) generate from the northeast (southeast in the southern hemisphere) and blow along the Equator. Westerlies generate from the west and blow northeast (southeast in the southern hemisphere).