Streck (Swedish Mil) (streck)

ScandinavianTraditional unit (still used in some regions)

One 6,300th of a full turn, the Swedish military unit. Close to a milliradian (1/6,283).

1 streck (Swedish mil) = 0.0001587301587 turns (approximately).

About the streck (Swedish mil)

Swedish gunners divided the circle into 6,300 parts and called each one a streck, which is Swedish for a stroke or line. One streck is therefore 1/6300 of a turn, close to a milliradian, since a true circle holds about 6,283.185 of those. The rounding gave artillery officers a convenient number, because a milliradian covers about one meter at a distance of one thousand meters.

Other armies picked different round numbers. NATO uses 6,400 mils per circle and the Warsaw Pact used 6,000, so mixing the systems in range calculations leads to errors of a few percent. The idea of an angular mil goes back to the Swiss engineer Charles-Marc Dapples in the mid-nineteenth century, and France adopted it for artillery around the First World War.

Sweden later moved to the NATO mil, and before 2007 its defence forces still used the streck, so it is now an obsolete military convention.

Sources: Wikipedia: Milliradian; Wikipedia: Angular mil

Streck (Swedish Mil) conversion chart

1 streck (Swedish mil) expressed in every other angle unit:

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