Pyramid of the Sun

The name Pyramid of the Sun comes from the Aztecs, who visited the city of Teotihuacan centuries after it was abandoned; the name given to the pyramid by the Teotihuacanos is unknown. It was constructed in two phases. The first construction stage, around 200 AD, brought the pyramid to nearly the size it is today. The second round of construction resulted in its completed size of across and high, making it one of the largest pyramids in the world, though still just over half the height of the Great Pyramid of Giza (146 metres). The second phase also saw the construction of an altar atop of the pyramid which has not survived into modern times. Over the structure, the ancient Teotihuacanos finished their pyramid with lime plaster imported from surrounding areas, on which they painted brilliantly colored murals. While the pyramid has endured for centuries, the paint and plaster have not and are no longer visible. Jaguar heads and paws, stars, and snake rattles are among the few images associated with the pyramids. It is thought that the pyramid venerated a deity within Teotihuacan society. However, little evidence exists to support this hypothesis. The destruction of the temple on top of the pyramid, by both deliberate and natural forces prior to the archaeological study of the site, has so far prevented identification of the pyramid with any particular deity. ==Structure measurements, location and orientation==

The pyramid was built on a carefully selected spot, from where it was possible to align it both to the prominent Cerro Gordo to the north and, in perpendicular directions, to sunrises and sunsets on specific dates, recorded by a number of architectural orientations in Mesoamerica. The whole central part of the urban grid of Teotihuacan, including the Avenue of the Dead, reproduces the orientation of the Sun Pyramid, while the southern part exhibits a slightly different orientation, dictated by the Ciudadela. ==Excavations underneath the Pyramid==

The caves and tunnel systems underneath the pyramid have been investigated by various archaeologists who have all concluded that these caves were sacred to those in Teotihuacan in the same way that caves were important cross-culturally in Mesoamerica. Different ethnic groups were said to have emerged from caves and cavities, known as the "wombs of the Earth"; many glyphs using the symbol for caves have been discovered by archaeologists; and they were used as sites for offerings and sacrifices to the various gods and deities associated with caves, such as the earth deity Tepeyolotl and the cave-dwelling fire deity Xiuhtecuhtli. For example, in the Etzalcualiztli fiesta, a holiday celebrating Tláloc, the god of rain, sacrifices and offerings were placed in a cave. In 1959, archaeologist Rene Millon and his team of researchers were some of the first archaeologists to study the tunnel system underneath the Pyramid of the Sun. While some of these tunnels were made after the fall of Teotihuacan and the Aztecs, they eventually connected to tunnels and caves that were made during the periods of these civilizations. The investigations led by Millon revealed that most of the main tunnels were sealed off, although whether this was purposeful or not is up to interpretation. The tunnels provided pieces of pottery, hearths, and other meticulously made artifacts from other cultures also evidenced elsewhere in Teotihuacan. Millon and his team ultimately concluded that, due to the influence of different cultures on the artifacts found in the tunnels, either the pyramid was built continuously over various periods of time by the people in Teotihuacan, or that the foundation and cave system were made in one period and the pyramid was built on top in a later period. Millon and his team believe that earlier theories that the pyramids in Teotihuacan were built by slaves are incorrect; the craftsmanship of the pyramid, as well as the popularity of Teotihuacan amongst its peoples, suggests the people who built the pyramids had the motivation to do so, whether they immigrated from elsewhere in Mesoamerica or not. In 1971, archaeologist Ernesto Taboada discovered an entrance to a seven-meter-deep pit at the foot of the main staircase of the Pyramid of the Sun. For example, archeologist Doris Heyden says: The cave was likely built early in Teotihuacan's history as a shrine that was later covered with the Pyramid of the Sun. The site of the shrine served as a ceremonial place for the Aztec people as it held significant religious history for the city of Teotihuacan, and was a focal point for society as it was located on the Street of the Dead. The city layout of Teotihuacan incorporated alignments dictated by the astronomically significant orientation of the Pyramid of the Sun: the peak of the pyramid aligned with the horizon in order to serve as a natural marker of the sun's position on the Aztec quarter days of the year. Thus, this cave is more important than most in Aztec culture and religion. Recently, scientists have used muon detectors to try to find other chambers within the interior of the pyramid. ==Recovered artifacts==

Only a few caches of artifacts have been found in and around the pyramid. Obsidian arrowheads and human figurines have been discovered inside the pyramid and similar objects have been found at the nearby Pyramid of the Moon and Pyramid of the Feathered Serpent in the Ciudadela. These objects may have represented sacrificial victims. A unique historical artifact discovered near the foot of the pyramid at the end of the nineteenth century was the Teotihuacan Ocelot, which is now in the British Museum's collection. In addition, burial sites of children have been found in excavations at the corners of the pyramid. It is believed that these burials were part of a sacrificial ritual dedicating the building of the pyramid. ==See also==