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  2. Kurtosis - Wikipedia

    en.wikipedia.org/wiki/Kurtosis

    Between the blue curve and the black are other Pearson type VII densities with γ 2 = 1, 1/2, 1/4, 1/8, and 1/16. The red curve again shows the upper limit of the Pearson type VII family, with γ 2 = ∞ {\displaystyle \gamma _{2}=\infty } (which, strictly speaking, means that the fourth moment does not exist).

  3. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    To adjust a 14 MOA scope 3 MOA down and 1.5 MOA right, the scope needs to be adjusted 3 x 4 = 12 clicks down and 1.5 × 4 = 6 clicks right; To adjust a 1 ⁄ 8 MOA scope 3 MOA down and 1.5 MOA right, the scope needs to be adjusted 3 x 8 = 24 clicks down and 1.5 × 8 = 12 clicks right; Comparison of minute of arc (MOA) and milliradian (mrad).

  4. Beam divergence - Wikipedia

    en.wikipedia.org/wiki/Beam_divergence

    where f is the focal length of the lens. [1] Note that this measurement is valid only when the beam size is measured at the rear focal plane of the lens, i.e. where the focus would lie for a truly collimated beam, and not at the actual focus of the beam, which would occur behind the rear focal plane for a divergent beam.

  5. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The correct branch of the multiple valued function arctan x to use is the one that makes ν a continuous function of E(M) starting from ν E=0 = 0. Thus for 0 ≤ E < π use arctan x = arctan x, and for π < E ≤ 2π use arctan x = arctan x + π. At the specific value E = π for which the argument of tan is infinite, use ν = E.

  6. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    For instance to move the line of sight 0.4 mrad, a 0.1 mrad scope must be adjusted 4 clicks, while comparably a 0.05 mrad and 0.025 mrad scope must be adjusted 8 and 16 clicks respectively. Others ⁠ 1.5 / 10 ⁠ mrad and ⁠ 2 / 10 ⁠ mrad can be found in some short range sights, mostly with capped turrets, but are not very widely used.

  7. Surface grinding - Wikipedia

    en.wikipedia.org/wiki/Surface_grinding

    A surface grinder is a machine tool used to provide precision ground surfaces, either to a critical size or for the surface finish. The typical precision of a surface grinder depends on the type and usage, however ±0.002 mm (±0.0001 in) should be achievable on most surface grinders.

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