<P> Reasonably accurate folk astronomy, such as is usually attributed to Stone Age peoples or later Celts, would arrive at east and west by noting the directions of rising and setting (preferably more than once each) and choosing as prime direction one of the two mutually opposite directions that lie halfway between those two . The true folk - astronomical definitions of east and west are "the directions, a right angle from the prime direction, that are closest to the rising and setting, respectively, of the sun (or moon). </P> <P> Being the "default" direction on the compass, north is referred to frequently in Western popular culture . Some examples include: </P> <Ul> <Li> The phrase "north of X" is often used by Americans to mean "more than X" or "greater than X", i.e. "The world population is north of 7 billion people" or "north of 40 (years old)". </Li> </Ul> <Li> The phrase "north of X" is often used by Americans to mean "more than X" or "greater than X", i.e. "The world population is north of 7 billion people" or "north of 40 (years old)". </Li>

Where did the term north 40 come from
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