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	Eng ID	Term	Definition
	5181	subsurface mark	See UNDERGROUND MARK.
	5182	subsurface sound channel	The SUBMARINE SOUND CHANNEL which is adjacent to the water surface.
	5183	subtense bar	A horizontally held bar of precisely determined length, used to measure distances by observing the angle it subtends at the distance to be... more A horizontally held bar of precisely determined length, used to measure distances by observing the angle it subtends at the distance to be measured.
	5184	subtense method	A procedure by which distance measurements are obtained by use of a SUBTENSE BAR.
	5185	sue	The vertical amount which a vessel aground dries due to the fall of the TIDE.
	5186	sugar loaf	A descriptive term for a conical HILL.
	5187	sugar loaf sea	Waves that rise into sugar loaf shapes, with little WIND, possibly resulting from intersecting WAVES.
	5188	summer solstice	See SOLSTICE.
	5189	summer time	See TIME: DAYLIGHT SAVING.
	5190	summit	The highest point, part or ELEVATION; top or APEX.
	5191	Sumner line	A CELESTIAL LINE OF POSITION, particularly one established by the SUMNER METHOD. Named after Captain Thomas H. Sumner, the discoverer of th... more A CELESTIAL LINE OF POSITION, particularly one established by the SUMNER METHOD. Named after Captain Thomas H. Sumner, the discoverer of the LINE OF POSITION by celestial observation.
	5192	Sumner method	The establishing of a LINE OF POSITION from the OBSERVATION of the ALTITUDE of a CELESTIAL BODY by assuming two LATITUDES (or LONGITUDES) ... more The establishing of a LINE OF POSITION from the OBSERVATION of the ALTITUDE of a CELESTIAL BODY by assuming two LATITUDES (or LONGITUDES) and calculating the LONGITUDES (or LATITUDES) through which the LINE OF POSITION passes.
	5193	sun	The luminous CELESTIAL BODY at the centre of the SOLAR SYSTEM, around which other CELESTIAL BODIES revolve.
	5194	sun: apparent	The actual SUN as it appears in the sky. Also called true sun.
	5195	sun: mean	A fictitious SUN conceived to move eastward along the CELESTIAL EQUATOR at a rate that provides a uniform measure of TIME equal to the avera... more A fictitious SUN conceived to move eastward along the CELESTIAL EQUATOR at a rate that provides a uniform measure of TIME equal to the average APPARENT TIME. It is used as a reference for reckoning MEAN TIME, ZONE TIME, etc.
	5196	sun: true	See SUN: APPARENT.
	5197	sun compass	See COMPASS.
	5198	sundial	An instrument that indicates TIME by the position of the shadow of a pointer or GNOMON cast by the SUN on the face of a DIAL marked in HOURS... more An instrument that indicates TIME by the position of the shadow of a pointer or GNOMON cast by the SUN on the face of a DIAL marked in HOURS.
	5199	sunken rock	A ROCK potentially dangerous to SURFACE NAVIGATION, the SUMMIT of which is below the lower limit of the zone for ROCK AWASH.
	5200	sunrise	The crossing of the APPARENT HORIZON by the upper LIMB of the ascending SUN.
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