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Celestial navigation requires solving a spherical triangle to determine a position line, specifically by calculating the estimated altitude and azimuth of a celestial body.0:16 The process relies on three primary variables: the declination of the body, the observer's estimated latitude, and the local hour angle. The Nautical Almanac provides the declination, which represents the latitude of the body's perpendicular projection on Earth. The local hour angle is derived by combining the body's Greenwich hour angle—sourced from the Almanac—with the observer's estimated longitude. For stars, the calculation incorporates the Aries point and either the right ascension or sidereal angle. Once these parameters are established, the observer calculates the zenith distance and altitude to plot a line of position. Practical application involves choosing between different Almanac formats, such as the English version designed for logarithmic tables or the Spanish version requiring an electronic calculator. Mastering sextant use and Almanac data extraction remains essential for accurate results.

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