sixty-fourth note ( synonym found)
Definition of sixty-fourth note:

°(nautical) A navigational device for deriving angular distances between objects so as to determine latitude and longitude.
°One sixth of a circle or disc; a sector with an angle of 60°.
Definition of sixty-fourth note:

°(nautical) A navigational device for deriving angular distances between objects so as to determine latitude and longitude.
°One sixth of a circle or disc; a sector with an angle of 60°.
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