-mechanical calendar created by Zhang Heng.
The Book of Jin Tian Wenzhi records: "When Shun Di arrived, Zhang Heng made another elephant ... and turned it into a room in a temple through water leakage. The existence of stars corresponds to the sky. Because of his embarrassment, he turned to Switzerland to stand on the steps, and the moon was full, and he started and fell according to the calendar. " The pod is a legendary tree. It gives birth to a pod every day. After pod 15, one pod is dropped every day and then grows again. Inspired by this, Zhang Heng created the Ruilun zigzag, which is equipped with a mechanism. Fifteen dials with cam function are installed on a vertical shaft, so that they act on the fifteen zigzags in turn, and each one will rise and fall at an appropriate time. Then, put the Ruilun pod next to the terrace outside the armillary sphere hall. Connected to the drip pot, it is also connected to the armillary sphere by leakage. From the beginning of each month, one piece of konoha leaves will be transferred out every day, and 15 will be transferred out on the day of 15 * *, and then another piece will be transferred every day, which will be reduced in turn until the moon sets. Because the lunar calendar is in harmony with the movement of the moon, this instrument can not only display the date, but also show the increase and decrease of the moon round after round, that is, it rotates and opens again and again according to the order of new moon, winding, looking at the sun, winding and dark day in the lunar calendar, so that people can get the effect similar to an activity calendar from the Swiss wheel.
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