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  2. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    1 in 333: 0.1146° 0.2%: 2‰ 1 in 500: ... Gradients can be expressed as an angle, as feet per mile, feet per chain, 1 in n, x % or y per mille. Since designers like ...

  3. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    The subtension is linear with the distance, for example, at 500 yards, 1 MOA subtends 5.235 inches, and at 1000 yards 1 MOA subtends 10.47 inches. Since many modern telescopic sights are adjustable in half ( ⁠ 1 / 2 ⁠ ), quarter ( ⁠ 1 / 4 ⁠ ) or eighth ( ⁠ 1 / 8 ⁠ ) MOA increments, also known as clicks , zeroing and adjustments are ...

  4. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    Left: An angle of 1 ... at 6 mrad its distance is 1000 m, and if the angle of view is twice as large (12 mrad) the distance is half as much, 500 m. ...

  5. Gradian - Wikipedia

    en.wikipedia.org/wiki/Gradian

    In trigonometry, the gradian – also known as the gon (from Ancient Greek γωνία (gōnía) 'angle'), grad, or grade [1] – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees.

  6. Degree (angle) - Wikipedia

    en.wikipedia.org/wiki/Degree_(angle)

    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).

  7. Degree of curvature - Wikipedia

    en.wikipedia.org/wiki/Degree_of_curvature

    The degree of curvature is defined as the central angle to the ends of an agreed length of either an arc or a chord; [1] various lengths are commonly used in different areas of practice. This angle is also the change in forward direction as that portion of the curve is traveled.

  8. Rifleman's rule - Wikipedia

    en.wikipedia.org/wiki/Rifleman's_rule

    500 Bullet Height (cm)-1.50: 0.0-2.9-11.0 ... The gunsights are usually adjustable in unit of 1 ⁄ 2 minutes, 1 ⁄ 4 minutes of angle or 0.1 milliradians. Analysis

  9. Chiliagon - Wikipedia

    en.wikipedia.org/wiki/Chiliagon

    A regular chiliagon is represented by Schläfli symbol {1,000} and can be constructed as a truncated 500-gon, t{500}, or a twice-truncated 250-gon, tt{250}, or a thrice-truncated 125-gon, ttt{125}. The measure of each internal angle in a regular chiliagon is 179°38'24" or rad.