In 2002, Juan Belmonte and Mauro Zedda measured the entrance orientations (declinations and azimuths) of 272 simple nuraghes and of the central towers of 180 complex ones. The data revealed clear peaks corresponding to orientations pointing to the sunrise at winter solstice and to the Moon at its southernmost rising position. These alignments remained constant throughout the history of nuraghe. The most common declinations revealed were of around −43° for the earlier nuraghes, shifting to just −45½° for the later. Zedda has suggested that the target is likely a star, quite possibly Alpha Centauri.