Archaeoastronomy in the Khmer Heartland GIULIO MAGLI, Politecnico di Milano, ItalyThe heartland of the Khmer empire is filled with magnificent monuments built over the course of many centuries. These monuments include the world-famous "state temples," such as Angkor Wat, and also many other temples as well as huge water reservoirs. Using data from Google Earth as well as GIS and reconstructing the ancient sky with Stellarium, we investigate the relationships of astronomy with orientation and topography in a systematic fashion, following the methods of modern Archaeoastronomy and strictly keeping at bay vague and/or esoteric proposals put forward by previous writers. As a result, a very clear pattern of cardinal orientation and alignment arises, connected with the temples' symbolism and the management of power by the Khmer kings. As a bonus, a comparison with the Angkor monuments allows us to put forward an explanation for the anomalous orientation of two unique "peripheral" state temples of Cambodia.