In 1868, King Mongkut of Siam predicted a total solar eclipse with astonishing accuracy, then used the event to host French and British astronomers at a remote beach in Prachuap Khiri Khan. This episode unpacks Mongkut's lifelong passion for astronomy — how he learned from Jesuit missionaries and Western texts, calculated the eclipse by hand, and staged a scientific demonstration that doubled as a diplomatic gambit. We discuss his rivalry with French astronomer Father Secrétan, the precise coordinates Mongkut calculated for the eclipse center, and how the event impressed colonial powers enough to buy Siam breathing room. But the eclipse also came at a cost: the king fell ill during the expedition and died weeks later. This story reveals how Mongkut blended traditional kingship with modern science, and how a solar eclipse became a subtle assertion of Siamese sovereignty.
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