Abstract: An adjustment device for aligning a unit (1), which receives and/or transmits and/or focuses radiation, including a support (4) for positioning the adjustment device upon a foundation, a pivotal unit (3), which in reference to the support (4) can be rotated around a horizontal lower axis (6), and the unit (1) to be aligned can be rotated in reference thereto around an upper axis (7) positioned perpendicular in reference to the lower axis (6), and which upper axis is positioned horizontally in reference to a neutral position of the pivotal unit (3) in reference to a rotation of the pivotal unit (3) around the lower axis (6), a lower actuator drive (8) for rotating the pivotal unit (3) in reference to the support (4) around the lower axis (6), and an upper actuator drive (11) for rotating the unit (1) to be aligned around the upper axis (7) in reference to the pivotal unit (3), with the pivotal unit (3) comprising a base section (14) and at least one upper bearing section (15, 16), projecting upwards therefrom