America's first urban centers may have been located in the Supe Valley, Peru. After investigating the location and the orientation of the main built structures, we show that it is not only the presence of the Supe River that determines their orientation but also that astronomical relationships within the orientation of the buildings dictate their setting within the valley. The southernmost position of moonrise on the horizon seems to be the most important astronomical target. There is the possibility of a trend toward attributing greater importance to the June solstice sunrise and the rising of certain stars or asterisms. These orientations could relate to specific moments throughout the year, in particular to seasonal rains, subsequent river flooding, and agricultural cycles. This is one of the earliest examples of the interaction of land- and skyscapes in human cultures and indeed the first in the Americas.

中文翻译：

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河流与天空：卡拉尔社会的天文学和地形学，美国的第一个城市中心

美国的第一个城市中心可能位于秘鲁的苏佩谷。在调查了主要建筑结构的位置和方向后，我们发现不仅苏佩河的存在决定了它们的方向，而且建筑物方向内的天文关系决定了它们在山谷中的设置。地平线上月出的最南端似乎是最重要的天文目标。有一种趋势可能是更加重视六月至日的日出和某些恒星或星群的升起。这些方向可能与全年的特定时刻有关，特别是与季节性降雨、随后的河流泛滥和农业周期有关。