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In astronomical navigation, the intercept method, also known as Marcq St. Hilaire method, is a method of calculating an observer's position on earth (geopositioning). It was originally called the azimuth intercept method because the process involves drawing a line which intercepts the azimuth line. This name was shortened to intercept method and the intercept distance was shortened to 'intercept'.

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  • Recta d'altura (ca)
  • Recta de altura (es)
  • Intercept method (en)
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  • La recta d'altura és la línia de posició per excel·lència utilitzada en navegació astronòmica, descoberta per casualitat el 1837 pel capità Thomas H. Sumner. La recta d'altura és, en realitat, una aproximació al cercle de posició, o cercle d'altures iguals, en l'entorn proper a la posició veritable de l'observador, on es confonen arc i corda secant o arc i tangent. Aquest enginyós artifici matemàtic permet simplificar notablement els càlculs per obtenir la recta, i poder-la dibuixar a la carta nàutica mercatoriana. (ca)
  • La recta de altura es la línea de posición por excelencia usada en navegación astronómica, descubierta por casualidad en 1837 por el capitán Thomas H. Sumner.​La recta de altura, es en realidad una aproximación al círculo de posición, o circunferencia de alturas iguales, en el entorno cercano a la posición verdadera del observador, en donde se confunde arco y cuerda o arco y tangente. Este ingenioso artificio matemático permite simplificar notablemente los cálculos para obtener la recta, y poder dibujarla en la carta náutica mercatoriana. (es)
  • In astronomical navigation, the intercept method, also known as Marcq St. Hilaire method, is a method of calculating an observer's position on earth (geopositioning). It was originally called the azimuth intercept method because the process involves drawing a line which intercepts the azimuth line. This name was shortened to intercept method and the intercept distance was shortened to 'intercept'. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Intercept_Sight_Reduction-00.png
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  • La recta d'altura és la línia de posició per excel·lència utilitzada en navegació astronòmica, descoberta per casualitat el 1837 pel capità Thomas H. Sumner. La recta d'altura és, en realitat, una aproximació al cercle de posició, o cercle d'altures iguals, en l'entorn proper a la posició veritable de l'observador, on es confonen arc i corda secant o arc i tangent. Aquest enginyós artifici matemàtic permet simplificar notablement els càlculs per obtenir la recta, i poder-la dibuixar a la carta nàutica mercatoriana. (ca)
  • In astronomical navigation, the intercept method, also known as Marcq St. Hilaire method, is a method of calculating an observer's position on earth (geopositioning). It was originally called the azimuth intercept method because the process involves drawing a line which intercepts the azimuth line. This name was shortened to intercept method and the intercept distance was shortened to 'intercept'. The method yields a line of position (LOP) on which the observer is situated. The intersection of two or more such lines will define the observer's position, called a "fix". Sights may be taken at short intervals, usually during hours of twilight, or they may be taken at an interval of an hour or more (as in observing the Sun during the day). In either case, the lines of position, if taken at different times, must be advanced or retired to correct for the movement of the ship during the interval between observations. If observations are taken at short intervals, a few minutes at most, the corrected lines of position by convention yield a "fix". If the lines of position must be advanced or retired by an hour or more, convention dictates that the result is referred to as a "running fix". (en)
  • La recta de altura es la línea de posición por excelencia usada en navegación astronómica, descubierta por casualidad en 1837 por el capitán Thomas H. Sumner.​La recta de altura, es en realidad una aproximación al círculo de posición, o circunferencia de alturas iguales, en el entorno cercano a la posición verdadera del observador, en donde se confunde arco y cuerda o arco y tangente. Este ingenioso artificio matemático permite simplificar notablemente los cálculos para obtener la recta, y poder dibujarla en la carta náutica mercatoriana. (es)
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