THE ADJUSTMENT OF THE TROPIC YEAR IN TEOTIHUACÁN AND ITS RELATIONSHIP WITH THE CONIC LANDRACE OF CORN

Abstract

It is possible that men from Teotihuacán knew the tropic year (365.2422 days) which they calculated by using the cycles of 360, 365.25 and 480 days. It is postulated that the Rector Plane of Teotihuacán was designed to calculate the adjustment of the tropic year. When comparying the cycles of 360 vs 365.25 days, and this last one with 365.2422, it was necessary to add 5.25 days to 360 days and to substract 11.25 minutos to 365.25 days, in order to equal to a tropic year; at the end of the fourth tropic year 21 days were added and 45 minutes substrated. The cycles of 360 and 480 days will be equal to 1440 days (4/3). The cycle of 480 days the would be equal to 4/3 (365.25 days) and to 4/3 (365.2522 days), after adding 7 days to 480 days and substracting 15 minutes to 4/3(365.25 days), so that by the third cycle there were 480 days, 21 days and 45 minutes to add and to substract, respectively. At the end of 128 tropical years, by using the cycles of 360 and 480 days, the tropic year gains a complete day to the civil year of 365.25, to produce 366 days (leap year) which the teotihuacanos adjusted to 365 days. The map of Teotihuacán could indicate the morphological traits of the Conical landrace of maize, and how to select it, as it is suggested by the arquelogical cobs found in situ, aged 2000 years. The current high surface planted with conic corn in the Central Plateau, possible indicates that agroastronomy was of vital importance in the prehispanic agriculture.