For the imaging reconstruction, the momentary grid phase and roll angle is relevant. Nevertheless, in order to have a clean and easy to understand interface, the aspect solution is defined to be a discrete list of sets of a pointing vector in Solar fixed coordinates, a roll angle and a time mark. The pointing vector contains the x- and y-component of the angle from the direction towards the Sun center and the imaging z-axis as shown in Fig. 1 and is measured in arcseconds. The roll angle is defined as described above.