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The calendar now in almost universal use for civil purposes in which each year has 365 days, except leap years which have 366 days. Leap years are those years which are divisible by 4, and in the case of centurial years, those years divisible by 400. This calendar, a modification of the Julian calendar, was not adopted in Great Britain and the English colonies in North America until 1752. The calendar was instituted in 1582 by Pope Gregory XIII to keep calendar days in adjustment with the tropical year for the purpose of regulating the date of Easter and the civil and ecclesiastical calendars. gray i

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The cleaning, servicing, preservation, lubrication, inspection, and adjustment of equipment; it includes that minor replacement of parts not requiring high technical skill, internal alignment, or special locative training.


The process of adjusting magnetic compass correctors so as to remove half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed. This is done to equalize the error on opposite headings.


Bunker adjustment factor


A step adjustment to Coordinated Universal Time (UTC) to maintain it within 0.95s of UT1. The l second adjustments, when necessary, are normally made at the end of June or December. Because of the variations in the rate of rotation of the earth, the occurrences of the leap second adjustments are not predictable in detail.


The determination and application of corrections to observations, for the purpose of reducing errors or removing internal inconsistencies in derived results.


The adjustment of soundings for any departure from true depth because of the method of sounding or any fault in the measuring apparatus.


Deviation of a magnetic compass after adjustment or compensation. The values on various headings are called RESIDUALS.


The remaining deviation of a magnetic compass on various headings after adjustment or compensation.


The error in reading a sextant, due either to lack of proper adjustment or imperfection of manufacture.


The process of placing a vessel on various headings and comparing magnetic compass readings with the corresponding magnetic directions, to determine deviation. This usually follows compass adjustment or compass compensation, and is done to obtain information for making a deviation table.

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