To this day the Indians call the year _Jaab_ or _Haab_, and, while heathens, they commenced it on the 16th of July. It is worthy of notice that their progenitors, having sought to make it begin from the precise day on which the sun returns to the zenith of this peninsula on his way to the southern regions, but being destitute of instruments for their astronomical observations, and guided only by the naked eye, erred only forty-eight hours in advance. That small difference proves that they endeavoured to determine, with the utmost attainable correctness, the day on which the luminary passed the most culminating point of our sphere, and that they were not ignorant of the use of the gnomon in the most tempestuous days of the rainy season. They divided the year into 18 months, as follows: 1st, Pop, beginning on the 16th of July. 2d, Uoo, beginning on the 5th of August. 3d, Zip, beginning on the 25th of August. 4th, Zodz, beginning on the 14th of September. 5th, Zeec, beginning on the 4th of October. 6th, Xul, beginning on the 24th of October. 7th, Dze-yaxkin, beginning on the 13th of November, 8th, Mol, beginning on the 3d of December. 9th, Dchen, beginning on the 23d of December. 10th, Yaax, beginning on the 12th of January. 11th, Zac, beginning on the 1st of February. 12th, Quej, beginning on the 21st of February, 13th, Mac, beginning on the 13th of March. 14th, Kankin, beginning on the 2d of April. 15th, Moan, beginning on the 22d of April. 16th, Pax, beginning on the 12th of May. 17th, Kayab, beginning on the 1st of June. 18th, Cumku, beginning on the 21st of June.