estimating the height of an object: a 4-inch stick (or multitool ruler) held at arms length creates an angle of roughly 10 degrees. At 25 feet, a 10° angle translates to 4 feet; at 50 feet, it becomes 8 feet; at 100 feet it's 16 feet, etc.
Hey, that's cool. I didn't know that.
-Blast, learning something without the need for penicillin
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