Abstract: A solar drying apparatus for removing the moisture from granular materials, sludge, or the like which utilizes the sun's rays and convection air currents includes an angled surface for retaining a layer of the material to be dried and a transparent cover disposed above the surface for permitting convection air currents to flow therebetween. A raking device disposed between the surface and the transparent cover causes displacement of the drying material thereby causing it to move slowly down the angled or inclined surface. A feed mechanism is disposed at the upper edge of the angled surface to insure a continuous flow of raw material and a removing device is disposed proximate the lower edge of the angled surface to continuously remove the dried material from the drying apparatus.