The telescopes of the Pierre Auger Fluorescence detector will use a segmented mirror. To align the segments we have developed four methods, which use: a) the image of the stop border, b) the image of a screen with concentric circles and c) the Ronchi pattern. Adding to these, we have developed a new method d). Instead of the Ronchi ruling, we have used a circular grid. In this case we obtain a moire´ pattern for each segment by means of which the experimental setup is simplified and the sensitivity of the alignment is improved. ©2001 American Institute of Physics.