one-in-sixty rule

This rule says that one unit of distance subtends an angle of one degree at 60 units of distance. For example, a chord of 5 miles will subtend an angle of 5° at 60 miles and 21/2° at 120 miles. Also called the rule of sixty.

Aviation dictionary. 2014.

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  • rule-of-sixty — As per this rule, one unit of distance subtends an angle of one degree at a 60 units of distance. For example, a chord of 5 miles will subtend an angle of 5° at 60 miles and 21/2° at 120 miles. Also called the one in sixty rule …   Aviation dictionary

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