A solar radiation distribution sensor containing a plurality of individual, directional solar radiation detectors (in our case-24 solar cells), positioned evenly on a semispherical body member, was designed to intercept directional solar radiation emanating from the sky. In addition, the sensor will supply the common radiation data of the conventional instruments, as well as solar radiation data on various tilts and azimuthal surface angles. The sensor is attached to a data-logging and processing unit, and it may be constructed as a self-contained instrument, including the semispherical body-member and the unit for the data logging, processing and recording, or the radiation sensor may operate in conjunction with a computer. The performance of the sensor has been tested and compared with the measurements of the standard instruments, and a good agreement has been obtained. The sensor may be used by meteorological and research institutions, and also in solar energy engineering applications. The paper describes the construction of the sensor, theoretical considerations, and the test results.