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Sight reduction is the process of deriving from a sight the information needed for establishing a line of position. Sight is defined as the observation of the altitude, and sometimes also the azimuth, of a celestial body for a line of position; or the data obtained by such observation. Nowadays sight reduction uses the equation of the circle of equal altitude to calculate the altitude of the celestial body, and the azimuth is obtained from by: With the observed altitude , and are the parameters of the Marcq St Hilaire (Intercept method) intercept for the line of position:

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  • Sight reduction
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  • Sight reduction is the process of deriving from a sight the information needed for establishing a line of position. Sight is defined as the observation of the altitude, and sometimes also the azimuth, of a celestial body for a line of position; or the data obtained by such observation. Nowadays sight reduction uses the equation of the circle of equal altitude to calculate the altitude of the celestial body, and the azimuth is obtained from by: With the observed altitude , and are the parameters of the Marcq St Hilaire (Intercept method) intercept for the line of position:
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  • Sight reduction is the process of deriving from a sight the information needed for establishing a line of position. Sight is defined as the observation of the altitude, and sometimes also the azimuth, of a celestial body for a line of position; or the data obtained by such observation. Nowadays sight reduction uses the equation of the circle of equal altitude to calculate the altitude of the celestial body, and the azimuth is obtained from by: With the observed altitude , and are the parameters of the Marcq St Hilaire (Intercept method) intercept for the line of position: With the latitude (North - positive, South - negative), the longitude (East - positive, West - negative), is the local hour angle, and are the declination and Greenwich hour angle of the body observed, and the calculated altitude. is the calculated azimuth of the body. Basic procedures involved computer sight reduction or longhand tabular methods.
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