Solar orientation with respect to the aligned pit features. Top panels show the elevation of the Sun over the local horizon, while the bottom panels show the angular separation between the orientation of the features (red dashed line in Fig. 7) and the projected solar orientation on the local horizon. Both angles are given as a function of the heliocentric distance (left panels) and time (right panels) for a period covering one full comet orbit with steps of 30 days for revolution and 30 min for rotation (see text for details).