Nautical words



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Mean High -Water Springs. Mean height of spring high waters at a place when deduced from an adequate number of observations.

Mean Latitude. That latitude whose numerical value is half the sum of a latitude left and a latitude reached.

Mean Low Water. Mean of all low waters at a place when observed during a lunation of 29 days.

Mean Low-Water Springs. Mean height of spring low waters at a place when deduced from an adequate number of observations.

Mean Noon. Instant in which Mean Sun is on meridian of a place.

Mean Place of Star. That position on the celestial concave at which a star would appear to be if viewed from Sun. It is expressed in declination north or south of Equinoctial and sidereal time angle from First Point of Aries on January 1 of current year.

Mean Sea Level. Level that sea would maintain if no tidal effect were manifested and average meteorological conditions preĀ­vailed. For hydrographic and surveying purposes the level is derived from very prolonged and careful observations at an appropriate position - Newlyn, Cornwall, being selected for British standard level.

Mean Solar Day. Interval between successive transits of Mean Sun across a given meridian. Its length is the mean length of all apparent solar days in a year.

Mean Solar Year 221 Menkalin




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