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The optical effect is the result of several factors culminating to the magical moment: the position and tilt of the earth in relation to the sun at this time of the year, cloud conditions, enough winter rainfall or snow to actually get the water flowing, and the angle of sunset.
There’s only about a five-day window to see and capture this “firefall,” from around February 19th through the 24th
First time I saw that was in the movie Caine Mutiny. (It IS the same waterfall, right?)
The Caine Mutiny (1954) is the story of shipboard conflict and a mutiny aboard a WWII naval vessel, and the subsequent court-martial trial of the ship's captain.