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A milliradian (SI-symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). ). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or
A reticle with markings (hashes or dots) spaced with a one mrad apart (or a fraction of a mrad) are collectively called a mrad reticle. If the markings are round they are called mil-dots . In the table below conversions from mrad to metric values are exact (e.g. 0.1 mrad equals exactly 10 mm at 100 metres), while conversions of minutes of arc ...
Metric prefixes for submultiples are used with radians. A milliradian (mrad) is a thousandth of a radian (0.001 rad), i.e. 1 rad = 10 3 mrad. There are 2 π × 1000 milliradians (≈ 6283.185 mrad) in a circle. So a milliradian is just under 1 / 6283 of the angle subtended by a full circle.
0.291 mrad 29.1 mm 2.91 cm 1.15 in 1.047 in 1 mrad 3.438′ 1 mrad 100 mm 10 cm 3.9 in 3.6 in Exact ...
Metric units [ edit ] When using the SI or metric units , shooting accuracy is more easily measured in milliradians ("mil" or "mrad" for short), which is an arc -based angular unit corresponding to 1/1,000th of a radian , and mathematically a direct ratio between the length of a circular arc and its radius .
Angular sizes are given in milliradians (mrad), ranges in meters, and target sizes are shown in both in centimeters, millimeters and inches. Date: 23 October 2017:
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
2000π mrad ≈ 6 283.185 307 ... Using metric prefixes, the turn can be divided in 100 centiturns or 1000 milliturns, with each milliturn corresponding to an angle ...