DICTIONARY OF

Lump Sum Freight 210 Lyra
Lump Sum Freight. Agreed sum to be paid for carriage of cargo, on discharge, whether
part of cargo has been lost or not.
Lunar. Pertaining to Moon. Particularly applied to method of determining longitude by
measurements of Moon's distance from other heavenly bodies.
Lunar Cycle. Period of 19 years, after which full and new Moons will occur on same day of
same months. Also known as 'Cycle of Meton' or 'Metonic Cycle'.
Lunar Day. Interval between successive transits of Moon over any given meridian. Mean
value is 24 h 54 m mean solar time.
Lunar Distance. Angular distance of Moon from one of 14 heavenly bodies formerly
tabulated in Nautical Almanac. These bodies were Sun, four planets and nine selected stars.
Lunar Method. Determination of longitude by lunar distances.
Lunar Month. Interval between successive conjunctions of Moon and Sun. Mean value is
29 days 12 hours 44.05 minutes.
Lunar Observation. Altitude of Moon when taken for determining position.
Lunar Tables. Logarithmic tables for correcting apparent distance of Moon from a heavenly
body for refraction and parallax.
Lunation. Period taken by Moon to go through all her phases. Mean value is 29 days12hrs.
44 mins. 2.87 sees. 'Lunar Month.'
Lunisolar Constituent. Used in harmonic analysis of tides to represent the effect of
variations in relative distance and declination of Sun and Moon.
Lunitidal Interval. Mean time interval between Moon's transit at a place and occurrence of
next high water following.
Luper. Swivel hook used for twisting strands together when rope making.
Lurch. Sudden and long roll of a ship in a seaway.
Lustrum. Five-year period used when considering meteorological information extending
over a considerable time.
Lutine Bell. Bell of H.M.S. Lutine, formerly French La Ltitine. Vessel was wrecked near
Terschelling in 1799 while carrying £1,400,000 in gold. Bell was recovered in 1859 and is
now at Lloyd's in London. It is mounted inside Rostrum and is rung when news important to
members is to be announced. It weighs 106 Ib.
Lying To. Said of a vessel when stopped and lying near the wind in heavy weather.
Lyra. Constellation south of Draco and Cygnus. Has one navigational star, Vega.