Ancient astronomical observatories

monument site, collection of astronomical instruments in Jaipur, Rajasthan, India

name of specific instruments in India

architectural complexes at the ancient Maya city of Tikal in Guatemala

E-Groups are unique architectural complexes found among a number of ancient Maya settlements. They are central components to the settlement organization of Maya sites and, like many other civic and ceremonial buildings, could have served for astronomical observations. These sites have been discovered in the Maya Lowlands and other regions of Mesoamerica and have been dated to Middle Preclassical to Terminal Classic Period. thumb|275px|right|North Face of the Temple of Masks, E Group Uaxactun It has been a common opinion that the alignments incorporated in these structural complexes correspond

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