夫高而大者,莫大于天;厚而广者,莫广于地。体恢洪而廓落,形修广而幽清,可以玄象课其进退,然而宏远不可指掌也。可以晷仪验其长短,然其巨阔不可度量也。虽穷神知化不能极其妙,探𦣱索隐不能尽其微,是以诡异之说出,则两端之理生,遂有浑天、盖天,兼而并之。故能弥纶天地之道,有以见天地之𦣱,则浑天有灵宪之文,盖天有周髀之法,累代存之,官司是掌,所以钦若昊天,恭授民时。爽以暗蔽,才学浅昧,隣高山之仰止,慕景行之轨辙,负薪馀日,聊观《周髀》。其旨约而远,其言曲而中,将恐废替,濡滞不通,使谈天者无所取则,辄依经为图,诚冀颓毁重仞之墙,披露堂室之奥,庶博物君子,时逈思焉。
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