According to one reference work, “the Mayan calendar, although highly complex, was the most accurate known to man until the introduction of the Gregorian calendar. ” — Funk & Wagnalls New Encyclopedia.
Sipas një vepre referimi, « kalendari majan, edhe pse tepër i ndërlikuar, ishte më i sakti që ka njohur njeriu deri me daljen e kalendarit gregorian ». — Funk & Wagnalls New Encyclopedia.