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第451章 星星会掉下来吗(2 / 2)

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李承乾听罢若有所思的点点头。

打发掉一个,却又引来另一个,李承乾才刚问完,李恪又迫不及待的问道:

“那为什么月亮有时候是圆的,有时候又是半圆的?”

“那是因为阴影的作用,月球围绕着咱们脚下这片大地转动,而咱们脚下的这片大地又围绕着太阳转动,所以就造成了月球的阴晴圆缺…”

敬玄不厌其烦的向他们讲诉着来自后世的天文知识,反正这里也没别人,就当是睡前小故事好了。

不过三名皇家少年却越听越兴奋,根本就没有丝毫睡意,在大概弄明白敬玄所说的意思之后,李泰又提出了自己的疑问:

“你说咱们脚下的大地围绕太阳转动?那我为什么感觉不到丝毫头晕?”

李泰还是很好打发的,毕竟这家伙脑袋瓜子聪明,能举一反三,所以敬玄根本不用费什么力气就能向他说明:

“因为这片大地实在太大了,大到围绕太阳转动,却让人擦觉不到的地步,不过你若是真想知道,很简单,你白天立一根杆子在太阳底下,看看其阴影的变化便知道了。”

敬玄知道古人有时会通过日照变化来记录时辰,但却并没有人从深层处去研究日照为什么会发生变化,所以适时的抛出这样的“设想”应该能极大的加快古人们对天文学的理解程度。

至少不会一直困在“天圆地方”的概念里一直原地打转,但这种推翻前人默认的“假设性事实”,需要一位身份尊贵的强力人士才行,不然很容易招来口诛笔伐。

“你刚才说月球,月亮是圆的?那太阳也是圆的了?不会咱们脚下这片大地也是圆的吧?如果是圆的,那我们怎么没有掉下去?”

李恪十分敏锐的捕捉到了敬玄话中的“漏洞”,瞪着一双丹凤眼,认真的看向敬玄,不打算放过他脸上一丝一毫的表情。

敬玄只得也跟着坐了起来,拢了拢有些散乱的头发朝他说道:

“不但太阳月亮是圆的,就连天上的那些星辰也是圆的,只是圆的不规则罢了,至于为什么不掉下去,很简单,因为人类太渺小了,加上还有引力的作用,不过引力这种东西,属于物理学的范畴,将来等大学开课了我会专门讲,你现在只需知道这片土地有多大就好了,如果你还是不明白,不妨做做试验,做一只大球,然后放一只蚂蚁在上面,看它会不会掉下来…”

李泰一听有实验可做,立刻将脑子里那些稀奇古怪的想法抛到一边,兴致高昂的说道:

“做实验啊,我也要做,快教教我,要把球做多大才能形成人与这片大地相等的比例…”

敬玄闻言,面色古怪的看向他,还想比例?哪怕按照人与蚂蚁的比例缩小几万倍,那也得做一个直径几十上百公里的大球才行,可能吗?

“这么大?!”

李泰也愣住了:

“咱们脚下这片土地有这么大?”

敬玄苦笑着点点头:

“周长将近十万里呢,可不小。”

三位少年闻言面面相觑,震惊得说不出话来,好半天李承乾才用干涩的嗓音问道:

“青雀,咱们大唐从东到西有多少里来着?”

李泰张了张嘴,喉咙咕噜了两下,艰难的冒出几个字:

“不到四千里…”

相差二十几倍!

大唐这些年不是已经囊括了天下大部分的土地了么?怎么仍旧是九牛一毛?!

“那…天上的那些星星不会跟我们这里一样大吧?”

喜欢大唐黑脸神请大家收藏:大唐黑脸神本站更新速度全网最快。

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