only 7 of them match those calculated by the Zhuanxu calendar and 10 of them match those calculated by the Yin calendar. This means that the calendar used in <span class="nowrap">N<sub>-133</sub></span> was neither the Zhuanxu calendar nor Yin calendar. Historians and astronomers were excited by this discovery and attempted to figure out what system the calendar was based on.</p>
    
<p>Even though the calendar in <span class="nowrap">N<sub>-133</sub></span> was not one of the ancient six calendars, it is 