Largest pre-Hispanic calendar shown to the public

Mexico City- The largest and oldest lunar calendar ever found in Mexico was shown to the public for the first time, more than a year after it was discovered in the archaeological site of Tamtoc, in the state of San Luis Potosi, reports said Tuesday. The huge stone monolith from 600 BC weighs 27 tons. It is 8 metres wide and 4 metres tall, and was shown to Mexican media on Monday night by the head of the Tamtoc project Guillermo Ahuja, according to reports on Tuesday.

The calendar shows that Mexico's northeastern cultures, in the area known as Husteca, were influenced by the Olmeca culture that is historically found in the country's southeast.

The Tamtoc lunar calendar is older than the solar calendar of the Aztecs and provides evidence that northeastern Mexican cultures, generally considered to have developed late, merely developed independently.