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  2. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    It is especially popular as a unit of measurement with shooters familiar with the imperial measurement system because 1 MOA subtends a circle with a diameter of 1.047 inches (which is often rounded to just 1 inch) at 100 yards (2.66 cm at 91 m or 2.908 cm at 100 m), a traditional distance on American target ranges.

  3. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    Given a chord of length y and with sagitta of length x, since the sagitta intersects the midpoint of the chord, we know that it is a part of a diameter of the circle. Since the diameter is twice the radius, the "missing" part of the diameter is (2r − x) in length.

  4. Nikon F - Wikipedia

    en.wikipedia.org/wiki/Nikon_F

    Horizontal split-image rangefinder, 3 mm diameter 12 mm circle reference for center-weighted meter; compare with Types K, L. On early versions, the 12 mm circle was a fine-ground matte screen, similar to Type B. B Ground matte Fresnel Fine-ground matte, 12 mm diameter Similar to Type A but omitting split-image; also compare with Type J C

  5. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    A 100 mm focal length f /4 lens has an entrance pupil diameter of 25 mm. A 100 mm focal length f /2 lens has an entrance pupil diameter of 50 mm. Since the area is proportional to the square of the pupil diameter, [6] the amount of light admitted by the f /2 lens is four times that of the f /4 lens.

  6. 6.5mm Grendel - Wikipedia

    en.wikipedia.org/wiki/6.5mm_Grendel

    The case head diameter of the Grendel is the same as that of the 5.6×39mm (.220 Russian), 7.62×39mm and 6.5mm PPC cases. This diameter is larger than the 5.56×45mm NATO, thereby necessitating the use of a non-standard AR-15 bolt. The increased case diameter results in a small reduction in the magazine ammo capacities.

  7. Ice hockey rink - Wikipedia

    en.wikipedia.org/wiki/Ice_hockey_rink

    Each spot consists of a circle 2 feet (61 cm) in diameter (as measured from the outermost edges) with an outline 2 inches (5.1 cm) thick. Within the spot, two red vertical lines are drawn 3 inches (7.6 cm) from the left and right inner edges, and the area between these lines is painted red while the rest of the circle is painted white.

  8. Betelgeuse - Wikipedia

    en.wikipedia.org/wiki/Betelgeuse

    The trio measured the angular diameter of Betelgeuse at 0.047″, a figure that resulted in a diameter of 3.84 × 10 8 km (2.58 AU) based on the parallax value of 0.018″. [36] But limb darkening and measurement errors resulted in uncertainty about the accuracy of these measurements.

  9. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    With an appropriate lead and major diameter of the screw, a given amount of axial movement will be amplified in the resulting circumferential movement. For example, if the lead of a screw is 1 mm, but the major diameter (here, outer diameter) is 10 mm, then the circumference of the screw is 10π, or about 31.4 mm.

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