El Caracol appears to have many astronomical alignments. The building as a whole is aligned  to the northerly extremes at which Venus rises. A pair of turret windows seem to point to places on the western horizon where Venus pauses and changes its direction of motion in the sky. El Caracol's platform, an irregular rectangle, has a diagonal directed toward the winter solstice sunset and summer solstice sunrise. Windows are aligned to give unique sight lines toward these events, as shown below.

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from Michael John Finley   Saskatoon, Saskatchewan,  Canada