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第238章 天有多高地有多厚(2 / 2)

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“广义上讲,共有九重天,狭义上讲,共有五重。”

“何为九重天?”

“我们脚下大地头顶上的这片天,为第一重,包含在太阳那片天之内,太阳天的为二重天,银河的天为三重天,以此类推,整个宇宙这片最大的天,为第九重天!”

“什么?你是说,太阳的天,比我们头顶上的天要大?世人皆知,太阳每天东升西落,不过是我们头顶这片天上的一颗明灯罢了,太阳还有天外天?这简直是无稽之谈!”

“黄先生需知,眼见不一定为实,很多时候,眼睛也会骗人的,就好比说,你猜是我们脚下的大地大,还是太阳大?”

“自然是地大。”

“你看有没有一种可能,因为太阳离的太远,所以看上去很小,因为大地离的近,就在脚下,因此看上去很大?正如诗云,不识庐山真面目,只缘身在此山中。”

司马徽:卧槽,这两句诗,好富哲理啊,我身处山中,自然看不到山的全貌。

如此足以流芳百世的绝句,身为四大名儒的老夫,怎从没听说过?

“敢问将军,此诗出自何处?当真绝妙。”

“嗯——一个很喜欢吃彘肘肉的,姓苏的诗人所作。”

“还有此等人才?他日有机会,定要登门拜会一下。”

司马徽知道他是安乐王,黄承彦却不知,本来已经被司马徽把话题岔开,仍没完没了。

“既如何,敢问也明可知,太阳距此有多远?”

“3亿里。”

“多少?3亿里?你是说,你到过天上3亿里之外,亲手量过不成?否则,何来如此精准的里数?”

“黄先生可知《周髀算经》中,商高所作的勾股定理否?”

算学对他来说,只能算粗通,能做到快速算帐,还做不到深入细致的研究勾股定理,圆周率之类的高深程度。

“何解?”

“就好比,量那棵树,并非需要爬到树顶去量,只要熟练掌握勾股定理后,先量一下黄先生有多高,再通过太阳照射的影子,就能算出比例,再去量树的影子,就能得出树的高度,量太阳的距离,虽然比这复杂一些,比如使用月食法,日食法,金星凌日法,计算出来也并非难事。”

黄承彦听他说的言之凿凿,该死,问到一个自己不精通的领域。

他说的有鼻子有眼的,八成是那么回事了。

好想知道后面的答案。

“那么,地有多厚呢?”

“大约2万4千7百里。”

“何以晓得?地如此之厚?”

“因为,鄙人在来荆州之前,刚刚绕着地球转了一圈,得出的最大周长为八万零一百五十里,再除以圆周率3.,便得到地有多厚了。”

黄承彦骇然问道:“你是说,我们脚下大地,是个球?而非天圆地方?”

“太阳月亮都是圆的,黄先生觉得,地球会是例外吗?”

黄承彦仍自不信:“孔明是说,刚刚绕行一周?这怎么可能?何以证明?”

“你猜,曹操曹孟德,及其党羽,都去了哪里?”

这件事情还真听说过,去年被安乐王生擒后,改诛九族为流放,至于流放到哪里,只听说流放到了海外,具体不得而知。

“曹操等人没死?此贼犯下如此大罪,却只被流放海外?”

“上天有好生之德,陛下有仁慈之心,此举也是希望那些个怀有不臣之心之人,早日放下屠刀,回头是岸,现在投降,还有活路,再负隅顽抗下去,就没那么仁慈了。”

黄月英忍不住心中好奇,又问了一句:“师兄,那月亮有多远呢?”

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