Abstract: Method and arrangment in the automatic landing of an aircraft (1), comprising a unit (4) arranged on the aircraft (1) and designed to form an image of a group of radiation sources (3) located next to a runway (2), and a calculation device connected to the imaging unit (4) and designed to continuously calculate the position and orientation of the aircraft (1) in relation to the runway (2) using the image formed by the imaging unit (4), in which the radiation sources (3) are deployed at precisely plotted co-ordinates, which are stored in a memory situated in the calculation device, and in which the said co-ordinates are used in calculating the position and orientation of the aircraft (1) when landing.