Amberannelarsen
Created page with "{{Mexico-sidebar}}{{breadcrumb | link1=Mexico | link2= | link3= | link4= | link5=Dates and Calendars }} ==Online Resources== *Genealogical Feast Day Calendars ==Background== ===Mesoamerican Calendars (Pre-colonial Era)=== *'''Complex Systems:''' Ancient civilizations like the Olmecs, Mayans, and Aztecs developed sophisticated calendars based on astronomical observations and mathematical calculations.<ref>Miller, M..."