MEXICO CITY.- Interest in deciphering the sky, practiced during Prehispanic ages, is been retaken in 21st century at the Noche de Observacion Astronomica en Sitios Arqueologicos (Night of Astronomical Observation at Archaeological Sites), which first event took place in Tamtoc, San Luis Potosi in March 20th 2010. Considered the capital city of Huasteca Prehispanic culture, Tamtoc was an important sky observation point, being Huasteca world view closely linked to star movements. Centuries after, the interest of watching the sky and the path followed by stars is still present. At the night of astronomical observation organized by the Archaeology Coordination of the National Institute of Anthropology and History (INAH), hundreds of persons were able to do as their ancestors and watch the firmament. From 19:00 hours, visitors were allowed into the archaeological zone main square to take part in the activity guided by archaeologists Guillermo Cordova Tello and Estela Martinez Mora