![W_logo_color_pos_RGB logo](/images/default-source/brand-portal/logo/w_logo_color_pos_rgb.png?sfvrsn=1a0a3c43_3)
Sun path, sometimes also called day arc, refers to the daily and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. The relative position of the Sun is a major factor in the heat gain of buildings and in the performance of solar energy systems.