. Ancient civilizations of Mexico and Central America. Indians of Mexico; Indians of Central America. 138 MEXICO AND CENTKAL AMERICA by Katun 13 Ahau. These dates were such as might be reached by just such a base line as exists at Copan and it was first believed that they were exactly reached by it. Careful reconsideration of. Fig. 49. Diagram of the Astronomical Base Line at Copan giving readings at April 9 and September 2. Slight shifts were made in this line: at an early time it was arranged to read April 5 and September 6 and at a later time April 12 and August 30. the evidence in the insc
. Ancient civilizations of Mexico and Central America. Indians of Mexico; Indians of Central America. 138 MEXICO AND CENTKAL AMERICA by Katun 13 Ahau. These dates were such as might be reached by just such a base line as exists at Copan and it was first believed that they were exactly reached by it. Careful reconsideration of. Fig. 49. Diagram of the Astronomical Base Line at Copan giving readings at April 9 and September 2. Slight shifts were made in this line: at an early time it was arranged to read April 5 and September 6 and at a later time April 12 and August 30. the evidence in the inscriptions and a re-survey of the line of sight led to the interesting conclusion that the sun dial of Copan was originally set up in 392 A. D. to give sunset coincidences on April 5 and September 6. About 490 A. D. the stones were re- adjusted to give the April 9 and September 2 which are recorded on Altar U and still later a third and present arrangement was effected giving April 12 and August 30. Each pair of dates is "reciprocal" in the sense that one member marks the same inter- val after the Spring equinox that the other does before the Fall equinox. The shifting seems to have been decided upon by astronomical congresses,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Spinden, Herbert Joseph, 1879-1967. New York : American Museum of Natural History
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Keywords: ., bookcentury1900, booksubjectindianso, booksubjectindiansofmexico
