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Time, mean, or mean solar time
| Глоссарий морской лексики и терминологии (английский язык) |
That shown by a clock or watch when compensated for the unequal progress of the sun in the ecliptic, and which thence forms an equable measure of time.—to take time is for an assistant to note the time by a chronometer at each instant that the observer calls “stop,” on effecting his astronomical observation for altitude of a heavenly body, or for contact with the sun and moon, or moon and star.
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Compensated, английский
Chronometer, английский
- A timekeeper accurate enough to be used to determine longitude by means of celestial navigation.
- A valuable time-piece fitted with a compensation-balance, adjusted for the accurate measurement of time in all climates, and used by navigators for the determination of the longitude.
- An especially accurate and highly consistent marine timepiece designed to facilitate course-plotting. before the fifteenth century, the only reliable means of navigation was to follow known features on the shore. then acquisition of the compass from china via arabia, and the astrolabe from islam allowed european mariners to calculate their approximate north-south position (latitude) while out of sight of land. however, in the absence of a reliable means of measuring time, their east-west location (longitude) could only be “guesstimated” through a complex process known as dead reckoning. the resultant errors caused numerous shipwrecks. in 1713, the british parliament offered the then immense reward of ?20,000 for any means of determining longitude with an error of less than thirty miles (48 kms) after six weeks at sea. this demanded precise timekeeping to within three seconds per day while pitching and tossing and traveling from frigid arctic to steaming equator; a degree of accuracy which had seldom been achieved by the finest stationary clocks in temperate zones. sixty years later, the prize was won by john harrison, a yorkshire carpenter and selftaught horologist. his first machines were costly, complicated, and delicate; but soon he and pierre le roy of paris (independently) developed more rugged marine timekeepers with all the essential features of a modern chronometer. by then, invention of the sextant had provided a more accurate means of calculating latitude. thus, by the great naval wars of late 18th and early 19th centuries, shipmasters could set out on long voyages with confidence in making an accurate landfall or rendezvous. today, after more than two centuries of use, chronometers are being replaced by electronic timekeepers.
- Хронометр
Astronomical, английский
Астрономический
Observation, английский
- Наблюдение; измерение
- Наблюдение; измерение оцт object задача; цель
- Observación
- The process of watching and examining a person or thing over a period of time she was admitted to hospital for observation.
- N наблюдение
- Наблюдение
- In nautical astronomy, denotes the taking the sun, moon, or stars` altitude with a quadrant or sextant, in order thereby to find the latitude or time; also, the lunar distances.
- [1] general; the act of measuring some magnitude with an instrument, such as the time of an occultation (with a clock); the right ascension of a star (with a transit instrument and clock); the sun’s altitude, or the distance of the moon from a star (with a sextant); the temperature (with a thermometer); etc. [2] nautical; a celestial sighting, taken in order to calculate a time or position. [3] the information so acquired.
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Timenoguy, английский
Formerly a rope carried taut between different parts of a vessel, to prevent the sheet or tack of a course from getting foul in working ship; specially from the fore-rigging to the anchor-stock, to prevent the fouling of the fore-sheet.
Timber and room, английский
Is the distance between two adjoining timbers, which always contain the breadth of two timbers, and two or three inches besides. the same as room and space, or berth and space.
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