XXVI Congreso Internacional de Americanistas

- 94­
lenc1 ars re pre,ented the 360-da}' years. But, in the calendar on Maguey
pa per of th e Boban Col k ctíon, we have a 380·day calendar; because, in
addition to th e r8 fea sts of 20 days each, there are pictured at the top,
the 20 d ay- s ymbo~s , which correspünd to the 5 days left over each year ;
and which made the extra, or 19th feast, celebrated at the end of each.
fourth year. Although the upper part of thi s calendar is badly tom,
there can be seen dearly 12 complete di ff erent day-s-ym bols, and por­
'tions of the lowe r part of several others. The accompanying Plate is a
copy of th e main part of this Calendar of the Boban Collection, showing
the 18 feasts and the additional 20 day-s-y mbols; at the topo
Therefore, the Mexica ns had their 52-year cycle based absol utely on
the VIGESIMA L system:
1 st - The F east, or the zo-day period ..... .. ............ ... . ! X 20 = 20 days.
2nd - Every ord inary year had 18 Feasts ......... .. ..... . 18 X 20 = 360
3rd - - fourth 19 .... ... .. . . . ... . . . 19 X 2 0 t= 380
4th - Thus, the 4-year period had 73 Feasts ...... .. .. .. 73 X 20- I460
5th - The 52-year cycle contained:
13 4-year per·iods, or.... .... .......... .... .... 13 X 73 X 20 = 18