A device for determining the orientation error of a wind sensor with respect to the Geographic North Pole, comprising: - a first base (1.1) adapted for fixing the device to a support structure; - adjustment means for adjusting the relative azimuth orientation between the device and the wind sensor; - photosensing means (1.3) adapted for reading the Sun azimuth, - an output configured for providing at least the read Sun azimuth value ( A m) read by the photosensing means (1.3), and - a second base (1.2) adapted for fixing the wind sensor to the device, wherein: - the first base (1.1) and the second base (1.2) are spaced from one another according to a longitudinal direction; - the photosensing means (1.3) comprise a casing (1.3.1) and photosensing elements (1.3.2), wherein these photosensing elements (1.3.2) are located on a plane transverse to the longitudinal direction, coinciding with the vertical direction in an operative mode; - the photosensing means (1.3) are located between both bases (1.1, 1.2), such that, in an operative mode, the first base (1.1), the second base (1.2) and the photosensing means (1.3) are distributed according to the longitudinal direction; - the photosensing elements (1.3.2), according to the projection in accordance with the longitudinal direction on the plane containing same, are perimetrically surrounded by the casing (1.3.1); wherein the casing (1.3.1) has an essentially cylindrical or prismatic configuration and comprises in its side walls a plurality of vertical slits (1.3.1.1) equally distributed around the perimeter for the passage of rays of the Sun; wherein the slits (1.3.1.1) are oriented in the longitudinal direction which in an operative mode allow the passage of rays of the Sun to the photosensing elements (1.3.2) housed in said casing (1.3.1) for determining the read Sun azimuth value ( A m) depending on the illumination of the photosensing elements (1.3.2) by the rays of the Sun going through the slits (1.3.1.1) and the position of said slits (1.3.1.1). - a first base (1.1) adapted for fixing the device to a support structure; - adjustment means for adjusting the relative azimuth orientation between the device and the wind sensor; - photosensing means (1.3) adapted for reading the Sun azimuth, - an output configured for providing at least the read Sun azimuth value ( A m) read by the photosensing means (1.3), and - a second base (1.2) adapted for fixing the wind sensor to the device, - the first base (1.1) and the second base (1.2) are spaced from one another according to a longitudinal direction; - the photosensing means (1.3) comprise a casing (1.3.1) and photosensing elements (1.3.2), wherein these photosensing elements (1.3.2) are located on a plane transverse to the longitudinal direction, coinciding with the vertical direction in an operative mode; - the photosensing means (1.3) are located between both bases (1.1, 1.2), such that, in an operative mode, the first base (1.1), the second base (1.2) and the photosensing means (1.3) are distributed according to the longitudinal direction; - the photosensing elements (1.3.2), according to the projection in accordance with the longitudinal direction on the plane containing same, are perimetrically surrounded by the casing (1.3.1); wherein the casing (1.3.1) has an essentially cylindrical or prismatic configuration and comprises in its side walls a plurality of vertical slits (1.3.1.1) equally distributed around the perimeter for the passage of rays of the Sun; wherein the slits (1.3.1.1) are oriented in the longitudinal direction which in an operative mode allow the passage of rays of the Sun to the photosensing elements (1.3.2) housed in said casing (1.3.1) for determining the read Sun azimuth value ( A m) depending on the illumination of the photosensing elements (1.3.2) by the rays of the Sun going through the slits (1.3.1.1) and the position of said slits (1.3.1.1).