Observatory sights in Sōng Shān & Dēngfēng
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In the town of Gàochéng, 15km southeast of Dēngfēng, is China's oldest surviving observatory. In 1276 the emperor ordered two astronomers to chart a calendar. After observing from the stone tower, they came back in 1280 with a mapping of 365 days, five hours, 49 minutes and 12 seconds, which differs from modern calculations by only 26 seconds. Regular southbound buses from Dēngfēng can take you here; catch them from any large intersection in the southeastern part of town.