Shading system for a transparent roof surface of a vehicle, in particular for a motor vehicle; - having a roller blind shaft which, mounted so as to be fixed to the vehicle and so as to be rotatable about the rotation axis thereof, is disposed in a central region of the transparent roof surface, wherein the roller blind shaft divides the transparent roof surface into a first and a second sub-region (14a, 14b); - having a first and a second roller blind web (5, 6) which for adjustment are able to be wound onto or unwound from the one roller blind shaft, respectively, from a retracted position to a deployed position in which the transparent roof surface is at least partially covered and vice versa, wherein each roller blind web (5, 6) comprises a first and a second end region (51, 52/61, 62), and wherein the two roller blind webs (5, 6) by way of the first end region (51, 61) thereof are in each case attached to the one rotor blind shaft in such a manner that the roller blind webs (5, 6) in a rotating movement of the roller blind shaft about the rotation axis thereof are wound or unwound mutually parallel on the rotor blind shaft in such a manner that the first roller blind web is disposed so as to cover a first sub-region and the second roller blind web is disposed so as to cover a second sub-region; - wherein the two roller blind webs (5, 6) are of identical length, - having two guide elements which for mounting and guiding the two roller blind webs (5, 6) in a displaceable manner run in the longitudinal direction (x) and are disposed so as to be mutually spaced apart in the transverse direction (y); - wherein the second roller blind web in an adjustment movement is mounted so as to be displaceable in the longitudinal direction, characterized - in that exactly one deflection element is provided, wherein the one deflection element effects a deflection of the first roller blind web by 180° and, while utilizing the pulley principle, this results in the distance being geared and the first sub-region being apportioned at a ratio to the second sub-region of 1:2; - in that the deflected first roller blind web in the region of the second end region thereof, in the region of the rotor blind shaft, is attached so as to be fixed to the vehicle, wherein the deflection element in an adjustment movement is displaced in the longitudinal direction. - having a roller blind shaft which, mounted so as to be fixed to the vehicle and so as to be rotatable about the rotation axis thereof, is disposed in a central region of the transparent roof surface, wherein the roller blind shaft divides the transparent roof surface into a first and a second sub-region (14a, 14b); - having a first and a second roller blind web (5, 6) which for adjustment are able to be wound onto or unwound from the one roller blind shaft, respectively, from a retracted position to a deployed position in which the transparent roof surface is at least partially covered and vice versa, wherein each roller blind web (5, 6) comprises a first and a second end region (51, 52/61, 62), and wherein the two roller blind webs (5, 6) by way of the first end region (51, 61) thereof are in each case attached to the one rotor blind shaft in such a manner that the roller blind webs (5, 6) in a rotating movement of the roller blind shaft about the rotation axis thereof are wound or unwound mutually parallel on the rotor blind shaft in such a manner that the first roller blind web is disposed so as to cover a first sub-region and the second roller blind web is disposed so as to cover a second sub-region; - wherein the two roller blind webs (5, 6) are of identical length, - having two guide elements which for mounting and guiding the two roller blind webs (5, 6) in a displaceable manner run in the longitudinal direction (x) and are disposed so as to be mutually spaced apart in the transverse direction (y); - wherein the second roller blind web in an adjustment movement is mounted so as to be displaceable in the longitudinal direction, - in that exactly one deflection element is provided, wherein the one deflection element effects a deflection of the first roller blind web by 180° and, while utilizing the pulley principle, this results in the distance being geared and the first sub-region being apportioned at a ratio to the second sub-region of 1:2; - in that the deflected first roller blind web in the region of the second end region thereof, in the region of the rotor blind shaft, is attached so as to be fixed to the vehicle, wherein the deflection element in an adjustment movement is displaced in the longitudinal direction.