Sumnern.

Brit.

/ˈsʌmnə/, U.S.

/ˈsəmnər/

Origin: From a proper name. Etymon: proper name Sumner.

Etymology: < the name of Thomas H. Sumner (1807–76), U.S. shipmaster.

Nautical.

I. Compounds.

1. As a modifier, often in the genitive. Designating a method, devised by Thomas Sumner on a voyage in 1837, of finding a vessel's position, employing an approximate value of latitude or longitude based on dead reckoning, in conjunction with an astronomical observation, to calculate a number of positions that define a line that must contain the true position. Also: designating a line determined by this method.Now rare except in Sumner line n. at sense 2.

ΘΚΠ

society > travel > travel by water > directing or managing a ship > [adjective] > method of finding position

Sumner1849

1843 B. Peirce Let. 16 Mar. in T. H. Sumner New & Accurate Method finding Ship's Position (front matter) My dear Bowditch, I have examined Capt. Sumner's processes, and they are founded on perfectly correct principles.]

1849 H. Raper Pract. Navigation & Naut. Astron. (ed. 3) 345 (heading) Position on a line of bearing. [Note] Or ‘Sumner's Method’.

1918 Amer. Math. Monthly 25 417 To find the latitude and longitude of a ship by the Sumner Method, two lines of position must be determined.

1976 P. Kemp Oxf. Compan. Ships & Sea 845 Sumner's position line, a systemized method of finding a ship's position by means of a sight.

2. Sumner line n. a line of position determined by Sumner's method (see sense 1).Cf. position line n. at position n. Compounds.

ΚΠ

1876 Nature 24 Aug. 347/1 The circle on any part of which the ship may be is now commonly called a Sumner circle of equal altitude. The short straight portion of it which in practice is drawn on the working chart, is called a Sumner line.

2007 J. H. Karl Celestial Navigation GPS Age iii. 29 Because Captain Sumner seems to have been the first to realize this fact, the straight-line LOP [= line of position] approximation is sometimes called the Sumner line.

†II. Simple uses.

3. A position determined by Sumner's method. Obsolete. rare.

ΚΠ

1924 R. Clements Gipsy of Horn xii. 228 I worked a Sumner, or position by double altitude.

This entry has been updated (OED Third Edition, September 2019; most recently modified version published online March 2022).

单词	sumner
释义	Sumnern. Brit. /ˈsʌmnə/, U.S. /ˈsəmnər/ Origin: From a proper name. Etymon: proper name Sumner. Etymology: < the name of Thomas H. Sumner (1807–76), U.S. shipmaster. Nautical. I. Compounds. 1. As a modifier, often in the genitive. Designating a method, devised by Thomas Sumner on a voyage in 1837, of finding a vessel's position, employing an approximate value of latitude or longitude based on dead reckoning, in conjunction with an astronomical observation, to calculate a number of positions that define a line that must contain the true position. Also: designating a line determined by this method.Now rare except in Sumner line n. at sense 2. ΘΚΠ society > travel > travel by water > directing or managing a ship > [adjective] > method of finding position Sumner1849 1843 B. Peirce Let. 16 Mar. in T. H. Sumner New & Accurate Method finding Ship's Position (front matter) My dear Bowditch, I have examined Capt. Sumner's processes, and they are founded on perfectly correct principles.] 1849 H. Raper Pract. Navigation & Naut. Astron. (ed. 3) 345 (heading) Position on a line of bearing. [Note] Or ‘Sumner's Method’. 1918 Amer. Math. Monthly 25 417 To find the latitude and longitude of a ship by the Sumner Method, two lines of position must be determined. 1976 P. Kemp Oxf. Compan. Ships & Sea 845 Sumner's position line, a systemized method of finding a ship's position by means of a sight. 2. Sumner line n. a line of position determined by Sumner's method (see sense 1).Cf. position line n. at position n. Compounds. ΚΠ 1876 Nature 24 Aug. 347/1 The circle on any part of which the ship may be is now commonly called a Sumner circle of equal altitude. The short straight portion of it which in practice is drawn on the working chart, is called a Sumner line. 2007 J. H. Karl Celestial Navigation GPS Age iii. 29 Because Captain Sumner seems to have been the first to realize this fact, the straight-line LOP [= line of position] approximation is sometimes called the Sumner line. †II. Simple uses. 3. A position determined by Sumner's method. Obsolete. rare. ΚΠ 1924 R. Clements Gipsy of Horn xii. 228 I worked a Sumner, or position by double altitude. This entry has been updated (OED Third Edition, September 2019; most recently modified version published online March 2022). < n.1849
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