A interesting mistery is the Desana (Amazon Tribe) calendar
and the Guarani Kiowa calendar this two tribes come for diferet groups etinicos are separated by 2.500Kilometers.
They had a year of 365 days another quarter of a day without leap year
The year beg begins with with the rising of the Pleiades (the called Seven Stars) that occurred around 5 to June 11
Each of the twelve months was beginning to appear the first "thread" of the new moon.The year had 12 months(Ara
) and 11,5 days.
Months names: in guarani
January NHEMONGUETA GWASU
February Avati RANGA ARY
March ARY JEROSY
April KUNUMI GWEROPU'√VA
May KUNUMI MONHESYRY
June MYMBAKA'AGWY IKYRAMA
July KO AHA ARY RO'Y
August Yvytu THERE TATATINA ARY
September OKY'S HENH’IMBAMA ROY REMBIARE
October JE JATYMA Avati MOROTI
November GWAVIRA ARY AJU guavira
December Avati MOROTI TUIXAMA
Now the interesting thing
the guarani Kiowa dont had years dates
but the Desana have.
Year 1783 of the creation
Year:533 of the Fall (?) Even the Desana cant explain what is the Fall (speculates that the Desana were more advanced in the past)
and this date somewhat macth with the end of the Kuikuru city the Acre earthorwks and the end of the Nhanguaibas in Marajo.
and Year:498 of the Kariwa(Whites) war
a guarani observatory
the sun shining in the Guarani observatory
A Desana observatory