It has actually been known that the Earth was round since the time of the ancient Greeks. I believe that it was Pythagoras who first proposed that the Earth was round sometime around 500 B.C. As I recall, he based his idea on the fact that he showed the Moon must be round by observing the shape of the terminator (the line between the part of the Moon in light and the part of the Moon in the dark) as it moved through its orbital cycle. Pythagoras reasoned that if the Moon was round, then the Earth must be round as well.
In the field of astronomy, Pythagoras taught that the earth and all heavenly objects were spheres. He reasoned this by looking at the moon. The light shining on the moon comes from reflected sunlight ... the moon merely acts as a projection screen. He observed that there is a curve to the zone between light and dark (the terminator) when it approached the edge of the moon. Only a spherical object would produce this curvature. If the moon were a sphere, must not all heavenly objects (including the earth) be spheres?
【 在 Huangchong (净坛使者) 的大作中提到: 】 : 西人说毕哥观月而知球 : It has actually been known that the Earth was round since the time of the : ancient Greeks. I believe that it was Pythagoras who first proposed that the : Earth was round sometime around 500 B.C. As I recall, he based his idea on : the fact that he showed the Moon must be round by observing the shape of the : terminator (the line between the part of the Moon in light and the part of : the Moon in the dark) as it moved through its orbital cycle. Pythagoras : reasoned that if the Moon was round, then the Earth must be round as well.
行者闻言，近前答曰：“师父啊，你只知月色光华，心怀故里，更不知月中之意，乃先天法象之规绳也。月至三十日，阳魂之金散尽，阴魄之水盈轮，故纯黑而无光，乃曰晦。此时与日相交，在晦朔两日之间，感阳光而有孕。至初三日一阳现，初八日二阳生，魄中魂半，其平如绳，故曰上弦。至今十五日，三阳备足，是以团圆，故曰望。至十六日一阴生，二十二日二阴生，此时魂中魄半，其平如绳，故曰下弦。至三十日三阴备足，亦当晦。此乃先天采炼之意。我等若能温养二八，九九成功，那时节，见佛容易，返故田亦易也。诗曰：前弦之后后弦前，药味平平气象全。采得归来炉里炼，志心功果即西天。”
什么地方说球了？只是个圆而已
【 在 Huangchong (净坛使者) 的大作中提到: 】
: 行者闻言，近前答曰：“师父啊，你只知月色光华，心怀故里，更不知月中之意，乃先
: 天法象之规绳也。月至三十日，阳魂之金散尽，阴魄之水盈轮，故纯黑而无光，乃曰晦
: 。此时与日相交，在晦朔两日之间，感阳光而有孕。至初三日一阳现，初八日二阳生，
: 魄中魂半，其平如绳，故曰上弦。至今十五日，三阳备足，是以团圆，故曰望。至十六
: 日一阴生，二十二日二阴生，此时魂中魄半，其平如绳，故曰下弦。至三十日三阴备足
: ，亦当晦。此乃先天采炼之意。我等若能温养二八，九九成功，那时节，见佛容易，返
: 故田亦易也。诗曰：前弦之后后弦前，药味平平气象全。采得归来炉里炼，志心功果即
: 西天。”
就是看到这一段想起来 月亮这么明显的是个球 被太阳照着亮一半 不知中外的古人 什么时候想出它的正确形状的
【 在 iloveYolanda (Josh) 的大作中提到: 】
: 什么地方说球了？只是个圆而已
西人说毕哥观月而知球
It has actually been known that the Earth was round since the time of the
ancient Greeks. I believe that it was Pythagoras who first proposed that the Earth was round sometime around 500 B.C. As I recall, he based his idea on the fact that he showed the Moon must be round by observing the shape of the terminator (the line between the part of the Moon in light and the part of the Moon in the dark) as it moved through its orbital cycle. Pythagoras
reasoned that if the Moon was round, then the Earth must be round as well.
In the field of astronomy, Pythagoras taught that the earth and all heavenly objects were spheres. He reasoned this by looking at the moon. The light shining on the moon comes from reflected sunlight ... the moon merely acts
as a projection screen. He observed that there is a curve to the zone
between light and dark (the terminator) when it approached the edge of the
moon. Only a spherical object would produce this curvature. If the moon
were a sphere, must not all heavenly objects (including the earth) be
spheres?
说实话，月球对着地球就那么一面，要理解月亮是个球体真的很难
【 在 Huangchong (净坛使者) 的大作中提到: 】
: 就是看到这一段想起来 月亮这么明显的是个球 被太阳照着亮一半 不知中外的古人
: 什么时候想出它的正确形状的
这个地方说的事情很有意思，月亮竟然还暗合毕达哥拉斯/勾股三角数 以及美钞
https://joedubs.com/pythagorean-triples/
而且里面那个月亮和地球直径对比，还是真的，月亮直径1737，地球6357-6378，恰好
大约是3/11
如果是个画家，估计会产生月亮是个球这种想法，因为明暗变化跟他们练习画的球体太相似了
【 在 BroPingtou (RISC-V) 的大作中提到: 】
: 说实话，月球对着地球就那么一面，要理解月亮是个球体真的很难
那也是理解earth是个球啊
【 在 Huangchong (净坛使者) 的大作中提到: 】
: 如果是个画家，估计会产生月亮是个球这种想法，因为明暗变化跟他们练习画的球体太
: 相似了
为啥？ 看到月亮明暗过渡的样子，想到天上这个月亮，很像画过的不同角度的球，不
是很自然吗？为啥跟大地有关？
这个宇宙观可以是这样：月亮就是挂在天花板上的一个球，地是个有边界的大平台，地的尽头是深渊，海水哗哗地往下流（别问那么漏水为啥还总有水，没见过宾馆流水墙吗），太阳每天从一边跳出来，再从另一边掉下去，但是掉得也不深，阳光从地的边上漏上来，远远地照在月亮上，就是我们看到的样子。
换句话说，世界是个大屋子，人就住在屋子里的一个大方桌子上，屋子天花板上挂着个球，屋子里就一盏灯，然后神仙拿着这个灯围着桌子找东西，我们住在桌子上的细菌就看到顶上的球被照出不同的形状
再进一步，月亮是栓在一根线上来回摆，所以我们有时候看到它出来的早一些，有时候晚一些，被太阳照到的地方也不一样，所以形状有周期变化。 数学家可以根据这个建
模，算出来线有多长。
【 在 BroPingtou (RISC-V) 的大作中提到: 】
: 那也是理解earth是个球啊
【 在 Huangchong (净坛使者) 的大作中提到: 】
: 西人说毕哥观月而知球
: It has actually been known that the Earth was round since the time of the : ancient Greeks. I believe that it was Pythagoras who first proposed that
the
: Earth was round sometime around 500 B.C. As I recall, he based his idea
on
: the fact that he showed the Moon must be round by observing the shape of
the
: terminator (the line between the part of the Moon in light and the part
of
: the Moon in the dark) as it moved through its orbital cycle. Pythagoras
: reasoned that if the Moon was round, then the Earth must be round as well.
苏美尔 苏美尔
明暗和地球上看到的球其实不一样，月亮因为基本上只有太阳一个光源照射，肉眼只能看出黑白。
地球上的球因为有周围物体的漫反射光源，所以会在暗面产生明暗交界线和过渡的渐变暗部。画画管这个叫三大面五大调。但是太空中的物体其实不是这样的。
月球在太空周围没有桌子墙壁产生的漫反射光线，所以黑白分明，三大面五大调里面很多地方区别很微弱，黑色部分和太空的黑色融在一起，确实可能觉得就是一个圆盘或者一个镰刀。
【在 Huangchong(净坛使者)的大作中提到：】
：为啥？ 看到月亮明暗过渡的样子，想到天上这个月亮，很像画过的不同角度的球，不
：是很自然吗？为啥跟大地有关？