While much of Europe tilted its head skyward on August 12, one royal detour in Copenhagen turned heads for an entirely different reason. King Frederik X of Denmark, a monarch better known for his love of horsepower and classic rock than celestial mechanics, made an unannounced stop at the Rundetaarn, the Round Tower at the heart of the Danish capital, to reopen its public observatory as a partial solar eclipse swept over the city.

Nobody had pegged the king as an astronomy buff. Cameras caught him swinging open the dome’s shutters himself, producing some striking images, before he settled in at the eyepiece of a telescope dating to 1929 to…

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