Note 452 — Chapter XCII

The Yncas ascertained the time of the solstices by means of eight towers on the east, and eight towers on the west of the city, put four and four, two small between two large ones. The smaller towers were eighteen or twenty feet apart, and the larger ones were the same distance, one on each side. The solstice was ascertained by watching when the sun set or rose between the smaller towers. G. de la Vega, i, lib. ii, cap. 22.