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Trecena is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Trecena books and related discussion.

Suggested News Resources

Al Dante non c'è due senza tre: cena...
C'è chi vive e lavora all'estero. Chi, pur stando a Trieste, non riesce a ritagliarsi gli spazi per gli amici di un tempo. O ancora, chi non sa come riallacciare i fili delle amicizie intrecciati sui banchi di scuola.
Stonehenge First Built in Wales, Study Claims
Stonehenge may have stood in Wales hundreds of years before it was dismantled and transported to Salisbury Plain in Wiltshire, a new research into megalithic bluestone quarries suggests.
Ten Sacred Calendars Testify of Christ
The Venus calendar skips one trecena about every twenty years to approximate the true Venus cycle of 583.92166 days.
Why are there seven days in a week?
A week made up of seven days is part of our modern global culture, but its origins date back to ancient civilisation. The Greeks gave us democracy, the Romans bridges and roads but it is probably from the ancient Babylonians that we get the seven-day week.
Mexica: people of the sun - extract from The Aztecs
Each trecena began with the number 1 and the day-name, which came up in the sequence of rotation. Thus, each combination was unique within the tonalpohualli cycle, for no day in any one week could be confused with that of another. It is clear from the ...

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