圖天圖說

圖天圖說

圭人丿丿司山丿星借日光,地影不及。說星月皆借日而光,月光有消長,星光則長明。葢因借光各有不同,月天在日天之下,受日光有遠近,因有消長。諸星之天在日天之上,日光昭星恆照其下面,雖或遠或近,而其下面恒有光,故居地上者視星常明焉。如圖甲爲日球,乙爲諸星之天,居日天之上,丙爲地球,丁爲地影,卽見日照諸星下,而而地上恒見諸星下面之光,且地影銳而有盡,不能及諸星之天,故諸星恒不朦也。下兹朔,均王弔,司以

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