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	Eng ID	Term	Definition
	6081	yard	A unit of length equal to 3 FEET, 36 INCHES, or 0.9144 METRE.
	6082	yaw (or yawing)	The ship's oscillation about a vertical axis approximately through the center of gravity of the vessel.
	6083	y-axis	A vertical axis in a system of RECTANGULAR COORDINATES; that line on which distances above or below (north or south of) a reference line are... more A vertical axis in a system of RECTANGULAR COORDINATES; that line on which distances above or below (north or south of) a reference line are marked, especially on a MAP, CHART, or graph. The line which is perpendicular to the X-AXIS and passes through the ORIGIN.
	6084	y-coordinates	See COORDINATES: PLANE RECTANGULAR.
	6085	year	A period of one REVOLUTION of the EARTH around the SUN.
	6086	year: anomalistic	The period of one REVOLUTION of the EARTH around the SUN, from PERIHELION to PERIHELION, averaging 365 DAYS, 6 HOURS, 13 MINUTES, 53.0 SECON... more The period of one REVOLUTION of the EARTH around the SUN, from PERIHELION to PERIHELION, averaging 365 DAYS, 6 HOURS, 13 MINUTES, 53.0 SECONDS in 1900, and increasing at the rate of 0.26 second per century.
	6087	year: civil	A YEAR of the Gregorian calendar of 365 DAYS in common YEARS, or 366 DAYS in leap (or bissextile) years.
	6088	year: sidereal	The period of one apparent REVOLUTION of the EARTH around the SUN, with respect to a fixed point, or a distant STAR devoid of proper motion,... more The period of one apparent REVOLUTION of the EARTH around the SUN, with respect to a fixed point, or a distant STAR devoid of proper motion, being 365 DAYS, 6 HOURS, 9 MINUTES, and 9.5 SECONDS in 1900 and increasing at the rate of 0.0001 second annually.
	6089	year: tropical	The period of one REVOLUTION of the EARTH around the SUN, with respect to the VERNAL EQUINOX. Because of PRECESSION OF THE EQUINOXES, this i... more The period of one REVOLUTION of the EARTH around the SUN, with respect to the VERNAL EQUINOX. Because of PRECESSION OF THE EQUINOXES, this is not 360° with respect to the STARS, but 50".3 less. A tropical year is about 20 minutes shorter than a SIDEREAL YEAR, averaging 365 DAYS, 5 HOURS, 48 MINUTES, and 46 SECONDS in 1900 and is decreasing at the rate of 0.00530 second annually. Also called astronomical, equinoctial, natural, or solar year.
	6090	Y-level	See LEVELLING INSTRUMENT: Y LEVEL.
	6091	young ice	Newly formed LEVEL ICE in the transition stage of development from ICE RIND or PANCAKE ICE to WINTER ICE. Thickness from 5 to 15 cm.
	6092	y-parallax	See PARALLAX.
	6093	zenith	The point where the direction of the PLUMB LINE produced above the HORIZON meets the CELESTIAL SPHERE.
	6094	zenithal projection	See PROJECTION: AZIMUTHAL.
	6095	zenith camera	A special CAMERA so designed that its OPTICAL AXIS may be pointed accurately toward the ZENITH. It is used for the determination of ASTRONO... more A special CAMERA so designed that its OPTICAL AXIS may be pointed accurately toward the ZENITH. It is used for the determination of ASTRONOMICAL POSITIONS by photographing the position of the STARS.
	6096	zenith distance	The vertical angle between the ZENITH and the object which is observed or defined. Zenith distance is the complement of the ALTITUDE. See ZE... more The vertical angle between the ZENITH and the object which is observed or defined. Zenith distance is the complement of the ALTITUDE. See ZENITH DISTANCE: DOUBLE.
	6097	zenith distance: double	A value of twice the ZENITH DISTANCE of an object, obtained by OBSERVATION and not by mathematical process.
	6098	zenith telescope	See TELESCOPE.
	6099	zero sounding(s)	See SOUNDING.
	6100	zodiac	The band of the sky extending 8.5° either side of the ECLIPTIC. The SUN, MOON, and navigational PLANETS are always within this band, with t... more The band of the sky extending 8.5° either side of the ECLIPTIC. The SUN, MOON, and navigational PLANETS are always within this band, with the occasional exception of Venus. The zodiac is divided into 12 equal parts, called 'signs', each part being named for the principal CONSTELLATION originally within it.
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