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第19章 花前月下,岂不美哉(1 / 2)

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朱家书房内,窗棂半敞。

天色渐明,窗外竹影摇曳。

书房内,案头堆满各类手抄书卷。

一炉沉水香,轻烟袅袅。

朱子柳手持一本《周髀算经》随意翻看,一边听着易逐云高谈阔论。

此时易逐云正说着用煤炭烧水驱动铁车,又提及必须拿下晋地,只因晋地煤炭储量丰富,还说那贺兰山简直就是一座煤山。

朱子柳听得哈欠连连,终忍不住打断道:“易大侠,这大地怎会是个悬空圆球,在下实在不解,还望易大侠指教。”

易逐云哈哈一笑,说道:“地体方圆之说,确实不易领会。在下有一拙见,能否为先生验证一番?”

朱子柳微微一怔,道:“哦?易大侠有何妙法?”

易逐云随手取来一张纸,三两下折成一只小船,又拿过一支毛笔当作桅杆,接着从书架上取下一镇纸、一方砚台。

易逐云将小船在砚台平面上推动,说道:“先生请看,若大地如这砚台般平坦,船行渐远,理应如豆子般逐渐缩小。船体平稳变小,最终成为一个黑点。”

朱子柳点头道:“此乃常理。”

易逐云转而将镇纸横放,拱起成弧形,缓缓推动纸船与毛笔,说道:“若大地有曲弧——”

话未说完,纸船船身已隐没在镇纸背面,唯有那毛笔杆还在晃动。

朱子柳揉了揉眉心,俯身凑近盯着看,神色间若有所思。

易逐云笑道:“船身竟先隐去……恰似钱塘观潮时,海舟归港,桅杆先现!此乃‘桅杆沉弧’之实验,先生若有空闲,可亲往临安验证一番!”

朱子柳虽没有仔细留意过这一现象,但见易逐云说得笃定,便微微点头应下。

易逐云旋即去拿案头烛台,四处找寻,寻得一黄杨木雕球,悬于烛前,又搬来屏风摆好位置,只见那白绢屏风上投下一道圆形黑影。

易逐云笑道:“先生可曾读过沈括论月食?‘月如铜丸,地如弹丸,暗虚圆影,地体之证’。”

说罢,忽以镇纸代替木雕球,屏上黑影顿时成了棱角状。

朱子柳着实没想到,易逐云这年纪轻轻的武夫竟读过沈括的书,他哪里晓得易逐云让耶律楚材招揽了一众大宋落魄读书人,专门为地圆说撰写注解。

朱子柳思索片刻,忽然拍案而起,说道:“果然!前年庚子月食,在下亲眼所见地影浑圆如磨镜,原来如此!”

话虽如此,心下却仍存疑虑,毕竟他见过不少江湖骗子。

想到易逐云之前那些“逆天言论”,分明是想做那天下之主,大宋、大理的地盘不够,连鞑子的地盘都嫌小……

想到此处,又觉易逐云“癔症”不轻,不禁低声沉吟道:“当真如此么?”

说时缓缓坐下,陷入沉思。

易逐云倒也不气馁,说道:“所谓‘天狗食月’,实则是‘地影遮月’,先生可慢慢求证。”

朱子柳本就好学,此刻来了兴致,困意全无,只觉这些说法颇为有趣,微微点头,表示日后定会求证。

但易逐云还没说完。

他随即铺开一张宣纸,拿起毛笔,以墨点描绘远山村落。

虽画技不佳,但他并不在意,只笑道:“此乃‘纸山穷目’,若大地平坦,登高望远,应能见千百里。”

说着将纸卷曲成筒,“然而实际上——”

朱子柳凑近一看,只见弧面遮蔽了大半墨点。不禁喃喃自语:“难怪登飞来峰时,目力所及不过数十里,却有‘闻说鸡鸣见日升’之句……”

朱子柳说着,忽又皱眉,疑惑道:“但若大地悬空,极地之民岂不是头足倒置?”

易逐云笑道:“这大地内部,犹如一块巨大磁石,咱们地上的人和物,就如同铁屑。昔日张衡说‘天如鸡子,地如黄中’,磁石吸引铁屑,恰似地心摄取万物。人在球面之上,本无上下之分。”

朱子柳微微皱眉,长叹一声:“浑天之说,竟与此理暗合!”

说罢起身,缓缓望向窗外,清晨阳光洒在他脸上,他又喃喃念道:“……致知在格物。物格而后知至,知至而后意诚,意诚而后心正,心正而后身修,身修而后齐家,家齐而后国治,国治而后天下平……”

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