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	Eng ID	Term	Definition
	3341	month: nodical	The interval of time between two successive passages of the MOON through the same NODE of its ORBIT. The length of the nodical month ave... more The interval of time between two successive passages of the MOON through the same NODE of its ORBIT. The length of the nodical month averages 27.21222 mean SOLAR DAYS. Also called dracontic month.
	3342	month: sidereal	The interval of time between two successive passages of the MOON past as FIXED STAR. The length of the sidereal month averages 27.321661... more The interval of time between two successive passages of the MOON past as FIXED STAR. The length of the sidereal month averages 27.321661 mean SOLAR DAYS.
	3343	month: synodical	The interval of time between two successive CONJUNCTIONS or OPPOSITIONS of the MOON. The length of the synodical month is 29.5305888 mean SO... more The interval of time between two successive CONJUNCTIONS or OPPOSITIONS of the MOON. The length of the synodical month is 29.5305888 mean SOLAR DAYS. Also called lunation or lunar month.
	3344	month: tropical	The average period of REVOLUTION of the MOON about the EARTH with respect to the VERNAL EQUINOX. The length of the tropical month averages... more The average period of REVOLUTION of the MOON about the EARTH with respect to the VERNAL EQUINOX. The length of the tropical month averages 27.321582 mean SOLAR DAYS.
	3345	monument	(U.S. terminology). In SURVEYING, a structure used or erected to mark the POSITION of a STATION; permanence is implied.
	3346	moon	The SATELLITE of the EARTH. See LIBRATIONS OF MOON and PHASES OF THE MOON.
	3347	moonbow	RAINBOW whose formation is the same as that of the ordinary RAINBOW, but whose light comes from the MOON and not from the SUN. Also called l... more RAINBOW whose formation is the same as that of the ordinary RAINBOW, but whose light comes from the MOON and not from the SUN. Also called lunar rainbow.
	3348	moor	(v.t.). To secure a boat or other floating thing to a fixed object or the seabottom.
	3349	mooring	A place where a vessel may be secured. (Usually in pl.) The equipment used to secure a vessel. The process of securing a vessel or oceanog... more A place where a vessel may be secured. (Usually in pl.) The equipment used to secure a vessel. The process of securing a vessel or oceanographic instruments other than anchoring with a single anchor.
	3350	mooring buoy	See BUOY.
	3351	morse code light	See LIGHT.
	3352	mosaic	In PHOTOGRAMMETRY, as assembly of AERIAL PHOTOGRAPHS whose edges usually have been torn, or cut, and matched to form a continuous photogra... more In PHOTOGRAMMETRY, as assembly of AERIAL PHOTOGRAPHS whose edges usually have been torn, or cut, and matched to form a continuous photographic representation of a portion of the EARTH's surface.
	3353	mosaic: controlled	A MOSAIC oriented and scaled to horizontal GROUND CONTROL; usually assembled from rectified PHOTOGRAPHS. See also ORTHOPHOTOMOSAIC, UNCONT... more A MOSAIC oriented and scaled to horizontal GROUND CONTROL; usually assembled from rectified PHOTOGRAPHS. See also ORTHOPHOTOMOSAIC, UNCONTROLLED MOSAIC.
	3354	most probable value	That value of a quantity which is mathematically determined from a series of observations and is more probably free of the effects of bl... more That value of a quantity which is mathematically determined from a series of observations and is more probably free of the effects of blunders and errors than any other value that might stem from the same series of observations.
	3355	mother vessel	The lead vessel when surveying with several vessels.
	3356	mount	A large HILL or MOUNTAIN, usually a detached, characteristically conical mass of earth. The term 'mount' is always used instead of MOUNT... more A large HILL or MOUNTAIN, usually a detached, characteristically conical mass of earth. The term 'mount' is always used instead of MOUNTAIN when it precedes a proper name.
	3357	mountain	A natural ELEVATION of the EARTH's surface rising more or less abruptly from the surrounding LEVEL, and attaining an ALTITUDE which, relat... more A natural ELEVATION of the EARTH's surface rising more or less abruptly from the surrounding LEVEL, and attaining an ALTITUDE which, relatively to adjacent ELEVATIONS, is impressive or notable.
	3358	mountains	On the seafloor, a well-delineated subdivision of a large and complex positive feature. See CORDILLERA.
	3359	mountain chain	A complexity of several MOUNTAIN RANGES.
	3360	mountain range	A line of MOUNTAINS. Also referred to as range of mountains.
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