In Chinese philosophy, yin and yang describes how apparently opposite or contrary forces are actually complementary, interconnected, and interdependent in the natural world, and how they give rise to each other as they interrelate to one another. Many tangible dualities (such as light and dark, fire and water, and male and female) are thought of as physical manifestations of the duality of yin and yang. [wikipedia]
Yang is thought to be the open or the sun. As a resault this cache is out in the open and should be very easy to find. The trek to find the cache will be tricky but once you get to the coordintes you should be able to quickly find the cache.