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The Elamite Ziggurat at Choghan Zanbil, said to be the best preserved of the remaining Ziggurats, was built in the 13th century BC to serve as temple and astrological observatory.
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The walls are aligned to the points of the compass. Each is -- at least at a casual viewing -- identical to the other with an entrance to the interior at the center.
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As the shadows edges move along the indentations of this sundial and line up with specific bricks the astrologers were able to read the exact time in order to calculate a correct ascendant.
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The sundial on the southern face has a pedestal with a dais angled to line up with the sunset at a particular day of the year. After some discussion the guides seemed to agree that it was for the winter solstice.
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