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What (who) is 1 in 60 rule - definition
1 in 60 rule
RULE OF THUMB USED IN AVIATION
In air navigation, the 1 in 60 rule is a rule of thumb which states that if a pilot has travelled sixty miles then an error in track of one mile is approximately a 1° error in heading, and proportionately more for larger errors. The rule is used by pilots with many other tasks to perform, often in a basic aircraft without the aid of an autopilot, who need a simple process that can be performed in their heads.
threescore
![[[Buckminsterfullerene]] C<sub>60</sub> has 60 carbon atoms in each molecule, arranged in a [[truncated icosahedron]].](https://commons.wikimedia.org/wiki/Special:FilePath/C60 Molecule.svg?width=200 "[[Buckminsterfullerene]] C<sub>60</sub> has 60 carbon atoms in each molecule, arranged in a [[truncated icosahedron]].")
![The [[icosidodecahedron]] has 60 edges, all equivalent.](https://commons.wikimedia.org/wiki/Special:FilePath/Icosidodecahedron.png?width=200 "The [[icosidodecahedron]] has 60 edges, all equivalent.")
NATURAL NUMBER
Number 60; Sixty; Threescore; ㉍
a.
Sixty, thrice twenty.
sixty
NATURAL NUMBER
Number 60; Sixty; Threescore; ㉍
(sixties)
Frequency: The word is one of the 700 most common words in English.
1.
Sixty is the number 60.
...the sunniest April in Britain for more than sixty years.
NUM
2.
When you talk about the sixties, you are referring to numbers between 60 and 69. For example, if you are in your sixties, you are aged between 60 and 69. If the temperature is in the sixties, it is between 60 and 69 degrees.
...a lively widow in her sixties.
N-PLURAL
3.
The sixties is the decade between 1960 and 1969.
In the sixties there were the deaths of the two Kennedy brothers and Martin Luther King.
N-PLURAL: the N
