This document describes the design of a box-type solar cooker. It discusses the aims and objectives of the solar cooker, which are to cook food using solar energy, reduce use of traditional stoves, and protect the local environment. It also outlines the types of solar cookers, including panel, box, and parabolic, and describes the working principles and advantages of the box-type solar cooker. The document then presents the theory behind solar cookers, discussing concepts like zenith angle, declination angle, latitude, and equations for calculating clear sky radiation, solar constant, and efficiency. It aims to apply this theoretical understanding to optimize the design of the box-type solar cooker.