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A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol ′, is a unit of angular measurement equal to 1 / 60 of one degree. [1] Since one degree is 1 / 360 of a turn, or complete rotation, one arcminute is 1 / 21 600 of a turn.
With the invention of the metric system, based on powers of ten, there was an attempt to replace degrees by decimal "degrees" in France and nearby countries, [note 3] where the number in a right angle is equal to 100 gon with 400 gon in a full circle (1° = 10 ⁄ 9 gon). This was called grade (nouveau) or grad.
A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [2] For example, a catheter with a French size of 9 would have an outer diameter of approximately 3.07 mm. While the French scale aligns closely with the metric system, it introduces redundancy and the potential for rounding errors.
Where degree of curvature is based on 100 units of arc length, the conversion between degree of curvature and radius is Dr = 18000/π ≈ 5729.57795, where D is degree and r is radius. Since rail routes have very large radii, they are laid out in chords, as the difference to the arc is inconsequential; this made work easier before electronic ...
So, a standard 50 mm lens for 35 mm film photography acts like a 50 mm standard "film" lens on a professional digital SLR (with crop factor = 1) and would act closer to an 80 mm lens (= 1.6 × 50 mm) on many mid-market DSLRs (with crop factor = 1.6). Similarly, the 40-degree angle of view of a standard 50 mm lens on a 35 mm film camera is ...
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Decimal degrees (DD) is a notation for expressing latitude and longitude geographic coordinates as decimal fractions of a ... 11.1 mm: 10.2 mm: 7.87 mm: 4.35 mm 8 0. ...