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A circle of 60 NM radius has a circumference of: 2 x 60 x π = 376.99 NM. 376.99 divided by 360° produces: 376.99/360 = 1.047 NM (off by 4.7%) This rule is therefore very good approximation. As a coincidence, 1 NM is about 6,000 feet (6,076.1 feet) so we can use the 60:1 rule for this too.
The 1 in 60 rule used in air navigation has its basis in the small-angle approximation, plus the fact that one radian is approximately 60 degrees. Interpolation
Since predicted or reported wind speeds are rarely accurate, corrections to the aircraft's heading need to be made at regular intervals. Skinny triangles form the basis of the 1 in 60 rule, which is "After travelling 60 miles, your heading is one degree off for every mile you're off course". "60" is very close to 180 / π = 57.30.
The basic assumption is that for angles up to around 60°, it is adequately accurate to assume that sine(A) = A, when A is expressed as a fraction of 60. Thus, the sine of 30° = 30/60 = 1/2 = 0.5. The clock code is a further method of visualising fractions of 60, since we are very used to expressing fractions of an hour (60 minutes) when ...
The 60-day rollover rule is one of the many traps that lie in wait for investors rolling over a retirement account such as a 401(k) or IRA. You have to follow the rules exactly, or you could end ...
There are lots of "rules" in investing that have long driven basic portfolio principles. The "60/40" rule, the "Rule of 72" and the newer "70/30" rule. The basic foundations surrounding these rules...
60/20/20 — 60% for necessary living expenses, 20% for savings and 20% for anything else 80/20 — 80% for spending and 20% for savings Does the 50/30/20 rule include 401(k) contributions?
Biological rules (1 C, 16 P) Pages in category "Rules of thumb" ... 1 in 60 rule; 1% rule; 1:5:200; 18-electron rule; 68–95–99.7 rule; A. Amara's law; Augustine's ...