Part of this is the teaching of the Maya Calendars, of which there are 20. Only 15 of them may be spoken of at this time.
其中一部分是玛雅历法的教导，总共有20处，其中有15处可能是在这个时候说出的。
The hieroglyphs date back to the ninth century, making them hundreds of years older than the calendars in the Maya Codices, which were recorded in bark-paper books from 1300 to 1521.
这些象形文字可以追溯到九世纪，比玛雅刻本历法提早了数百年。 玛雅刻本于公元1300年到1521年记载在树皮纸做的书上。
The Maya understood 17 different Calendars based on the Cosmos.
玛雅人明白到17种以宇宙为基础的不同历法。
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