The most recently accepted data is available on the Cosmographic Values Index page. Written history is a fragile, incomplete and recent record at best. The famed burning of the library of Alexandria or of Native American libraries exemplifies the easy destruction of vast stores of accumulated knowledge. The few surviving prehistoric Mayan codices evidence astronomic periodicities in the date sequences. These recent discoveries demonstrate the advanced astronomic knowledge of the Maya and illustrate the magnitude of lost knowledge.
History is subjective and readily altered to suit conquerors.
Furthermore, translations are limited by the conceptual limitations of both language and translator. In contrast, the archaeological record is objective, durable and also not temporally bounded. Dating from 5,700 to 5,200 years ago, three of the oldest surviving buildings on the earth, the Newgrange, Knowth and Dowth tumuli, dominate the landscape of the Plains of Kildare in Meath County, Ireland. Every year at the winter solstice sunrise a shaft of sunlight enters a long passage and illuminates Newgrange's large, elaborately petroglyphed, megalithic interior chamber. At sunset the calendric hierophany is repeated in Dowth mound.