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  2. 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.

  3. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    1 to −2 24 mm 0.079–0.157 in Very fine gravel Granule: 0 to −1 12 mm 0.039–0.079 in Very coarse sand: 1 to 0 0.51 mm 0.020–0.039 in Coarse sand

  4. 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.

  5. Angular diameter - Wikipedia

    en.wikipedia.org/wiki/Angular_diameter

    an object of diameter 725.27 km at a distance of 1 astronomical unit (AU) an object of diameter 45 866 916 km at 1 light-year; an object of diameter 1 AU (149 597 871 km) at a distance of 1 parsec (pc) Thus, the angular diameter of Earth's orbit around the Sun as viewed from a distance of 1 pc is 2″, as 1 AU is the mean radius of Earth's orbit.

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