Felix Verbelen, Ancient Astronomy
An extremely useful set of compilations of eclipse data (both lunar and solar) and heliacal
risings and settings of Venus; Felix has gone to a lot of trouble to provide these data, which cover the primary
date range and geographic area of most Mayan history.
Search the web for information about the Mayans, their calendar, writing, science, civilization, astronomy and culture.
I am not responsible for where you end up.