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The original was posted on /r/todayilearned by /u/Pfeffer_Prinz on 2024-08-27 15:55:09+00:00.
Original Title: TIL at the 1933 Chicago World’s Fair, the opening night lights were automatically activated when the star Arcturus was detected. This star was chosen since its light takes ~40 years to arrive, so the rays landing on Earth had begun their journey ~1893, the year of Chicago’s previous World’s Fair
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