[Problem] The purpose of the present invention is to provide a method for efficiently shading the whole of a fixed tract of land having no roofing, supports for a roof, or the like, such as schoolyard or a track and field stadium. [Solution] A sheet is anchored to a plurality of flying objects so that the sheet forms a fixed surface, and the flying objects are flown to a flying position (including height) determined on the basis of factors such as the position of the sun.
