Abstract: An arrangement for determining with high accuracy the angle of incidence of light, in particular sunlight, has low cost electronic components and low susceptibility to sources of interference and other error signals. An elongated photodiode array has a slot for a band of light to illuminate the photodiode array. The slot is arranged with a predefined spacing above and orthogonally to a preset longitudinal direction of the sensor array, which primarily presets the light's maximally detectable angle of incidence. The sensor array includes rows of several aligned congruent photodiode areas having substantially the same length and width. Each photodiode area has a size that generates a maximum photoelectric current when illuminated by the band of light. This current is sufficient in amount to be divided into a selected number and size of digital resolution stages.