In 1995, I realized after reading Dennis Tedlock's book, The Popul Vuh, that the Yucatan-lowlands Maya "count-of-days" that the-late DR. JOSÉ ARGÙELLES and most people then were using, was mis-calculated by 55 days, as of 1995.
Tedlock recorded that the Guatemala-highlands Maya, the oldest known Mayan communities, kept another "count-of-days" based exactly on the risings and settings of the planet Venus; their calendar is known as: the Guatemala-highlands Maya "count-of-days"."
So, in 1997, I switched-over to using the Guatemala-highlands Maya count-of-days.
The Mayan calendar needs to be adjusted every so often to keep it aligned with the risings and settings of the planet Venus.
Venus is seen-as the "Evening Star" during its 263-day journey thru the evening western skies, after which it disappears from view for 8 days.
Every 8 years, the day Venus disappears is ALWAYS on Mayan day Eb' or STAIRS, the 12th Mayan daysign on the 20-day mayan Month. For those 8 days Venus is then moving between the Sun and the Earth and can not be seen.
Then later, 8 days after disappearing, Venus reappears again in the pre-dawn eastern sky just before sunrise as the super bright "Morning Star". And this day every 8 years is ALWAYS Mayan day Ajaw or LORD, the 20th daysign on the 20-day mayan Month.
These two daysigns, Eb' or STAIRS and Ajaw or LORD, are always found in the Venus-cycle charts, in all four of the known ancient Mayan books or codices.
Here is a simple explanation from the website exploratorium.edu:
Like the sun, the position of Venus against the horizon appears to shift with the seasons. Venus shifts north in the summer and south in the winter. Exactly how far Venus shifts each year depends on where it is in its 8-year cycle, but the extreme points in the back-and-forth oscillation are known as the northern extreme and the southern extreme of Venus. An observer will see Venus rise at each of these extreme points once every 8 years.
The period-of-orbit of Venus around our Sun is 224.65 days and the period-of orbit of the Earth around the Sun is 365.25 days.
So the 260-day cycle is actually a tiny bit less-than a full 260-days...exactly 259.8-days, because of that "extra" .65 of a day each year. And the "extra" .256 of a day that Earth has creates the extra day over four years.
A combination of these factors is why the day Venus rises as the Morning Star every 8-years, on Mayan calendar day LORD Ajaw (or Ahau) needs to be adjusted BACKWARD a day earlier occasionally, and why the Mayan "New Year" arrives a day earlier every so often, from the adjustment made to the rising and setting of Venus, because of the periods of orbit of Venus and Earth around the Sun. Whew!
So, according to the Guatemala-highlands Maya count-of-days, the "Harmonic Convergence" weekend of August 16-17, 1987, occured on: Saturday, August 16 on 13 LORD ajaw (ahaw) Day #260, the most powerful day of- the calendar and the end of both a 52-year cycle AND the end of the NINE-52-year "Hell Cycles"; and Sunday, August 17 was 1 WATER LILY CREATURE imix, the very beginning of the 260-day calendar AND the beginning of a new 52-year cycle.
And not on: 2 JAGUAR hix day #54 and 3 EAGLE men day #55, as-per the Yucatan-lowlands Maya count-of-days used still now by most-followers of the research of the-late DR. JOSÉ ARGÙELLES.
Now, this does explain the Harmonic Convergence a lot better, I think.
It was hard to make that change-over to the Guatemala-highlands Maya count-of-days. I know, but I did.