So little is known about the calendar used by the Inca that one can hardly make a statement about it for which a contrary opinion cannot be found.

Most historians agree that the Inca had a calendar based on the observation of both the Sun and the Moon, and their relationship to the stars.
Names of 12 lunar months are recorded, as well as their association with festivities of the agricultural cycle;

In one account, it is said that the Inca Viracocha established a year of 12 months, each beginning with the New Moon,
and that his successor, Pachacuti, finding confusion in regard to the year, built the sun towers in order to keep a check on the calendar.
Since Pachacuti reigned less than a century before the conquest, it may be that the contradictions and the meagreness of
information on the Inca calendar are due to the fact that the system was still in the process of being revised when the Spaniards first arrived.

Despite the uncertainties, further research has made it clear that at least at Cuzco, the capital city of the Inca, there was an official calendar
of the sidereal–lunar type, based on the sidereal month of 27 1/3 days. It consisted of 328 nights (12 ´ 27 1/3) and began on June 8/9,
coinciding with the heliacal rising (the rising just after sunset) of the Pleiades; it ended on the first Full Moon after the June solstice
(the winter solstice for the Southern Hemisphere). This sidereal–lunar calendar fell short of the solar year by 37 days,
which consequently were intercalated.

 - abridged from the Encyclopedia Britannica online edition

NOW IS YOUR CHANCE TO OWN AN INCA CALENDAR IN ORIGINAL STONE CAST!

 
ARTICLE: 31-1/2" DIA X 2-1/4" THICKNESS
              80CM DIAMETER X 5.72CM THICKNESS
PACKED: 34" X 34" X 5" BOX
VOLUME: .083CBM
NET WT. 12 KGS / 26 LBS

GR. WT.: 14.50 kgs / 31.90 lbs

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