. . . Atop the pyramid at Lost World. Temple IV, where we saw sunrise, at left. The Maya had a very accurate knowledge of astronomy and the calendar. For example, from this pyramid, one can look east to three temples, and east beyond that the Plaza of the Seven Temples (not shown): Lining up these various temples puts them in exact line with the sun at the summer and winter solstices and the vernal and autumnal equinoxes . . .

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