They seem to have the same data I do and thus there information looks good. That page is basically saying what I said except they actually listed all of there reasons unlike me who simply posted the most logical answer with one supporting reference.
Also you may note that my argument is more culturally based then the one on that webpage and this is simply because that author has no first hand experience with Mayan civilization. Having personally seen there ruins first hand, you can really gain a deeper seance for the kind of people they were. I have traveled thought Europe and have seen over 10000 years of civilization but no where have I ever seen a people so driven by the stars as the Mayan. Even the placement of there buildings is determined by the heavens.
In Greece you can see from the placement and design of the ruins how everything was built on logic. In Rome how everything is aligned has its place and has a purpose and history to bring about order. In the Vatican how religious symbolism is expressed in every forum of Vatican City. In Spain where hundreds of years of war blend Christian and Muslim culture together within the very buildings they battled before. But in Mexico in the cities of the Mayans there is something that has not been seen before. Although the Egyptians aligned the pyramids to the stars it was not as though there culture and for that matter the layout of there cities followed this system. Instead like most civilizations around them placement for non religious structures had little to nothing to do with the stars. In Mayan cities virtually everything has a time and a place. For to the Mayans the universe was not simply a space filled with stars and planets but the container of time itself similar to how we view it today. When they aligned buildings and even roads with space they were not just placing them in a physically demisonal position but where placing them at an exact point in time as well.
For those of you who are interested in seeing stuff like this I really recommend going to Mexico to check it out because it really is like nothing you have or ever will see.
As for the sunsports that data is old and the trending is now wrong. The highest peek is now believed to be over and the next cycle believed to be smaller.
This model is the best prediction currently available that was updated this month all actual value sets go until Aug 3rd.