Now that piques my interest. Could you be more specific?

Using Stellarium, set the location to Tres Zapotes, but not knowing how far off the calendar's reckoning would be, the closest I have come is a partial solar eclipse, after 9pm on September 1, -23.

Stellarium literally indicates a "Year 0" so BC years could be off-by-one, or off-by-Julian-and-equinox-precession, I just have no idea.

Wikipedia doesn't list any [Lunar/Solar] that are anywhere near 32 BC.

Previously: https://news.ycombinator.com/item?id=45922610

Or they had a detailed record of all eclipses going back several hundred years. I guess it would make sense that this was the record but it's also plausible they had some ritual reason to refer to a date of an eclipse when building this thing.