Sumner Line

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Sumner line [′səm·nər ‚līn]

(navigation)

A line of position established by the Sumner method.

Any celestial line of position (deprecated usage).

Sumner Line

a celestial line of position established by the Sumner method. Sumner lines are straight lines of equal altitude and are widely used in navigation to determine the position of a ship or airplane through observations of the altitudes of celestial bodies.

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