I realize that to "double the cape" (by present definition) is to sail, or pass, by it--- especially around it. So, when one doubles Cape Horn, one has sailed past or around it into the Pacific Ocean if sailing west from the Atlantic. But where does this expression come from? Is it at all related the coastal navigation method of determining ones distance from a cape, promontory, lighthouse, or whatever, by doubling the angle on the bow? If so--what's that connection?
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