第十九章 课业
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“这个，叫天球仪。网址找回邮件：ltxsba@gmail.com而这个，叫地球仪。”
张德没有解释什么是天球仪，什么是地球仪，而是对台下年龄不一的少年们如是道，“你们已经学过了坐标，那么，坐标在生活中的具体作用，又是怎么用的呢？”
“测量临漳山的高度，测绘临漳山的地形，你们已经运用过等高线，也学会了比例尺。但是，当有人问你：这位老兄，请问临漳山在哪儿？你们如何回答？”
“很显然，你们会说：汉阳向西多少里，汉水往南多少里。这，就是坐标的作用。”
世界地图要画出来，除了个别类似所罗门群岛或者塞舌尔岛的冷僻地点，作为一条工科狗，大差不差都能画出来。
但要说精确到地球仪上投影如何如何按照比例，这依然需要测绘。当然，依照现在三大船队的实力，要做一次环球航行是完全没有问题的，从太平洋北部顺溜而下，最快两个月就能让贞观八年造大船抵达北美洲的西海岸。
不过张德从没提过这一点，三大船队的主要作用，除了劫掠之外，就是定点清除近海那些死活不肯合作的土著，然后，建立据点，开辟种植园或者盐场，接下来就是填奴隶进去榨取每一滴利润。
哗……
张德转动了地球仪：“今天我们要说的，就是为了天圆地方是错的，地如鸡子也是错的。”
地圆说提出的年代相当久远，但中古远古的学者，并不能解释这一切，因为没有实证。
可是数学家却在天体观测和周期计算中，隐约觉得“地如鸡子”是对的，可在无法证明的情况下，这并不符合统治精英们的需要。
正常、不正常、熊以及不熊的孩子们，在大脑当机之后，又懵逼了许久。他们的接受能力已经相当的好，《曹冲定理》让他们已经可以在船行上班，再学习的久一些，做个计吏也绰绰有余。
十四五岁的少年，已经将老迈的六七十岁的《算经》高手甩到了身后。
这是一群已经明白“力”，明白“加速度”，明白“质量”的孩子，学习是痛苦的，但求知欲，在无知之时，最是犹如无法戒断的瘾，让他们不管贫穷还是富余，都乐此不疲。
哪怕，他们现在学习的知识，似乎只能做底层的一员小吏，甚至连小吏都未必会用他们。唐朝的上升渠道，和他们无关。
这些“黔首”“工匠”“商贾”之子，通过科举拼搏一条光耀门楣的道路，大约和张德在今年就造出一台小霸王学习机的难度差不多。
极端冲击力的一堂课，张德允许他们怀疑，但并不会去解释。而是用数学来说话，潮汐和月亮的数学关系，地球和太阳的数学关系，都是实实在在反应在生活中。年、月、日，这是看得见摸不着的，但却真实的无以复加，哪怕再过一千年，也是这样的真实。
万年之前，千年之前，百年之前的人们，各有不同的人生际遇，但他们头顶的星空、月光、骄阳，只有微小的变化。
春分秋分对农官们而言是了如指掌的事情，老农或许知道，但更多的是不知道，他们一代代不管种多少年的地，最终还是要求到那些掌握农时知识的朝廷中人或者望族世家。
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