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	Eng ID	Term	Definition
	1241	datum level	See DATUM: VERTICAL CONTROL and DATUM: CHART.
	1242	datum line	See REFERENCE LINE.
	1243	datum of tide predictions	The LEVEL from which the HEIGHTS OF TIDE are referenced in the TIDE TABLES. See also DATUM: CHART.
	1244	datum plane	A VERTICAL CONTROL DATUM. Although a LEVEL SURFACE is not a plane, the VERTICAL CONTROL DATUM is frequently referred to as the datum plane.
	1245	datum point	See REFERENCE POINT.
	1246	day	The duration of one ROTATION of the EARTH, or occasionally another CELESTIAL BODY, on its AXIS. It is measured by successive TRANSITS of a r... more The duration of one ROTATION of the EARTH, or occasionally another CELESTIAL BODY, on its AXIS. It is measured by successive TRANSITS of a reference point on the CELESTIAL SPHERE over the MERIDIAN, and each type takes its name from the reference used. The period of daylight, as distinguished from night.
	1247	day: apparent solar	See DAY: SOLAR.
	1248	day: astronomical	A MEAN SOLAR DAY beginning at NOON.
	1249	day: civil	A MEAN SOLAR DAY beginning at MIDNIGHT.
	1250	day: constituent	The duration of one ROTATION of the EARTH on its AXIS, with respect to a fictitious STAR representing one of the periodic elements in the ti... more The duration of one ROTATION of the EARTH on its AXIS, with respect to a fictitious STAR representing one of the periodic elements in the tidal forces. It approximates the length of a LUNAR or SOLAR DAY. The expression is not applicable to a long-period constituent.
	1251	day: lunar	The duration of one ROTATION of the EARTH on its AXIS, with respect to the MOON. Its average length is about 24h50m of MEAN SOLAR TIME. Also... more The duration of one ROTATION of the EARTH on its AXIS, with respect to the MOON. Its average length is about 24h50m of MEAN SOLAR TIME. Also called TIDAL DAY. The duration of one ROTATION of the MOON on its AXIS, with respect to the SUN.
	1252	day: mean solar	See DAY: SOLAR.
	1253	day: sidereal	The duration of one ROTATION of the EARTH on its AXIS, with respect to the VERNAL EQUINOX over the UPPER BRANCH of a MERIDIAN. Because of th... more The duration of one ROTATION of the EARTH on its AXIS, with respect to the VERNAL EQUINOX over the UPPER BRANCH of a MERIDIAN. Because of the PRECESSION OF THE EQUINOXES, the sidereal day thus defined is slightly less than the PERIOD of ROTATION with respect to the STARS, but the difference is less than 0.01 SECOND. The length of the sidereal day is 24 HOURS of SIDEREAL TIME or 23h56m04.091s of MEAN SOLAR TIME.
	1254	day: solar	The duration of one ROTATION of the EARTH on its AXIS, with respect to the SUN. This may be either a mean solar day, or an apparent solar da... more The duration of one ROTATION of the EARTH on its AXIS, with respect to the SUN. This may be either a mean solar day, or an apparent solar day, as the reference is the MEAN or APPARENT SUN, respectively. The duration of one apparent ROTATION of the SUN.
	1255	day: tidal	See DAY: LUNAR and TIDAL DAY.
	1256	daybeacon	An unlighted BEACON. A daybeacon is identified by its colour, shape, and number of its daymark. The simplest form of daybeacon consists of a... more An unlighted BEACON. A daybeacon is identified by its colour, shape, and number of its daymark. The simplest form of daybeacon consists of a single pile with a daymark affixed at or near its top.
	1257	daylight saving time	See TIME.
	1258	daymark	1. The identifying characteristics of an aid to navigation which serve to facilitate its recognition against a daylight viewing background. ... more 1. The identifying characteristics of an aid to navigation which serve to facilitate its recognition against a daylight viewing background. On those structures that do not by themselves present an adequate viewing area to be seen at the required distance, the aid is made more visible by affixing a daymark to the structure. A daymark so affixed has a distinctive colour and shape depending upon the purpose of the aid. 2. An unlighted navigational mark.
	1259	day number	The sequentially numbered day of the year, usually starting with day number 1 on 1st January.
	1260	dead ahead	Bearing 000° relative. If the bearing is approximate, the term ahead should be used.
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