Method for landing an aircraft which takes off and lands vertically, aircraft and landing system

A method for landing an aircraft (1) at a landing site (9),

• wherein the aircraft (1) takes off and lands vertically, and
• wherein the landing site (9) is defined by a circular marking that can be detected optically (10) and has a circular outer contour, the method comprising:
• continuously electronically capturing camera images (11) by a camera device (5) arranged on the aircraft (1) and directed towards the landing site (9), which images each show a reproduction of the circular marking (10) detected at least in sections;
• evaluating each of the camera images (11) in a control device in an automated manner;
• using the control device to fit a geometric object with a straight line (12), which has a predetermined line slope in relation to the camera image (11), into the reproduction in such a way that the straight line (12) constitutes a tangent through a contact point (13) to the marking (10) detected at least in sections;
• and
• controlling the aircraft (1), by the control device, in the direction of the contact point (13).