An almanac is a calendar, in which are set down the rising and setting of the sun, the phases of the moon, the most remarkable positions and phenomena of the heavenly bodies, for every month and day of the year; also the several fasts and feasts to be observed in the church and state, etc, and often much miscellaneous information likely to be useful to the public.
The term is of Arabic origin, but the Arabs were not the first to use almanacs, which indeed existed from remote ages. In England they are known from the fourteenth century, there being several English almanacs of this century existing in manuscript form. They became generally used in Europe within a short time after the invention of printing; and they were very early remarkable, as some are still, for the mixture of truth and falsehood which they contained. Their effects in France were found so mischievous, from the pretended prophecies which they published, that an edict was promulgated by Henry III in 1579 forbidding any predictions to be inserted in them relating to civil affairs, whether those of the state or of private persons.
In the reign of James I of England letters-patent were granted to the two universities and the Stationers' Company for an exclusive right of printing almanacs, but in 1775 this monopoly was abolished. During the English Civil War, and thence onward, English almanacs were conspicuous for the unblushing boldness of their astrological predictions, and their determined perpetuation of popular errors. The most famous English almanac was Poor Robin's Almanac, which was published from 1663 to 1775.
Gradually, however, a better taste began to prevail, and in 1828 the Society for the Diffusion of Useful Knowledge, by publishing the British Almanac, had the merit of taking the lead in the production of an unexceptionable almanac in Great Britain. The example thus set has been almost universally adopted. The circulation of almanacs continued to be much cramped by the very heavy duty of one shilling and threepence per copy until 1834, when this duty was abolished. About 200 new almanacs were started immediately on the repeal.
Almanacs, from their periodical character, and the frequency with which they are referred to, are now more and more used as vehicles for conveying statistical and other useful information, some being intended for the inhabitants of a particular country or district, others for a particular class or party. Some of the almanacs that are regularly published every year are extremely useful, and before the Internet and improved communications were almost indispensable to men engaged in official, mercantile, literary, and professional business. Such in Great Britain were Thorn's Official Directory of the United Kingdom, the British Almanac, Oliver and Boyd's Edinburgh Almanac, and Whitaker's Almanac, now so well known.
In the United States was published The American Almanac, a useful compilation. The Almanach de Gotha, which first appeared at Gotha in 1764, contained in small bulk a wonderful quantity of information regarding the reigning families and governments, the finances, commerce, population, etc, of the different states throughout the world. It was published both in a French and in a German edition. Almanacs that pretend to foretell the weather and occurrences of various kinds are still popular in Britain, France, and elsewhere.
The Nautical Almanack was an important work published annually by the British government, two or three years in advance, in which was contained much useful astronomical matter, more especially the distances of the moon from the sun, and from certain fixed stars, for every three hours of apparent time, adapted to the meridian of the Royal Observatory, Greenwich. By comparing these with the distances carefully observed at sea the mariner could with comparative ease, infer his longitude to a degree of accuracy unattainable in the past by any other way, and sufficient in the past for most nautical purposes. This almanac was commenced in 1767 by Dr. Maskelyne, astronomer royal. The French Connaissance des Temps was published with the same views as the English Nautical Almanac, and nearly on the same plan. It commenced in 1679. Of a similar character was the Astronomisches Jahrbuch formerly published at Berlin. Research Almanac
A chart is a hydrographical or marine map, that is a draught or projection of some part of the earth's surface, with the coasts, islands, rocks, banks, channels, or entrances into harbours, rivers, and bays, the points of compass soundings, or depth of water, etc, to regulate the courses of ships in their voyages. The term chart is applied to a marine map; the term map is applied to a draught of some portion of land (often including sea also). A plane chart is one in which the meridians are supposed parallel to each other, the parallels of latitude at equal distances, and of course the degrees of latitude and longitude everywhere equal to each other. Research Chart
A chronometer was any instrument that measures time, as a clock, watch, or dial; but, specifically, this term is applied to those time-keepers which were used for determining the longitude at sea, or for any other purpose where an accurate measure of time was required, with great portability in the instrument. The chronometer differed from the ordinary watch in the principle of its escapement, which was so constructed that the balance was free from the wheels during the greater part of its vibration, and also in being fitted with a compensation adjustment, calculated to prevent the expansion and contraction of the metal by the action of heat and cold from affecting its movements. Marine chronometers generally beat half-seconds, and were hung in gimbals in boxes 6 or 8 inches square. The pocket chronometer did not differ in appearance from a watch except that it was somewhat larger. Research Chronometer
A globe is a sphere, a round solid body, which may be conceived to be generated by the revolution of a semicircle about its diameter. An artificial globe, in geography and astronomy, is a globe of metal, plaster, paper, pasteboard, plastic etc, on the surface of which is drawn a map, or representation of either the earth or the heavens, with the several circles which are conceived upon them, the former being called the terrestrial globe, and the latter the celestial globe. In the terrestrial globe the wire on which it turns represents the earth's axis, the extremities of it representing the poles. The brazenmeridian is a vertical circle in which the
artificial globe turns, divided into 360 degrees, each degree being divided into minutes and seconds. The brassmeridian receives the ends of the axis on which the globe revolves. At right angles to this, and consequently horizontal, is a broad ring of wood or brass representing the horizon; that is, the true horizon of the earth which lies in a plane containing the earth's centre. The horizon and brassmeridian are connected with the stand on which the whole is supported. On the surface of the globe, as on other maps, are marked parallels of latitude, meridians, etc. On a globe of some size the meridians are drawn through every 15" of the equator, each answering to an hour's difference of time between two places. Hence they are called the hour circles. A number of problems or questions, many of them more curious than useful, may be solved by means of a terrestrial globe. Among the most important are such as to find the latitude and longitude of a place, the difference of time between two places, the time of the sun's rising and setting for a given day at a given place, etc.
Magnetic north is the pole of the lines of magnetic force that run north and south through the earth. It changes its position slightly from year to year, but in general it is in an area north of Canada, roughly at longitude 97 degrees West and latitude 71 degrees North. Research Magnetic North
John Harrison was a British clock maker. He was born in 1693 at Foulby, Yorkshire and died in 1776. The son of a carpenter, he taught himself the elements of mechanics and in 1715 he produced an eight-day clock which struck the hour, and indicated the day of the month. This clock had all wooden wheels apart from the escapement. He invented a method of compensation which enabled timepieces to be used on ships to determine longitude, compensating for the variations in the rate of the timepiece caused by temperature variations. Research John Harrison
The longitudinal fissure runs down along the longitude of the cerebrum, separating the left and right hemispheres. It is interrupted in the intermediate region by the corpus callosum, which connects the two hemispheres. Research Longitudinal Fissure
In astronomy, a conjunction, is the position of two of the heavenly bodies, as two planets, or the sun and a planet, when they have the same longitude (are in the same direction from the earth). When it is simply said that a planet is in conjunction, conjunction with the sun is to be understood. Superior conjunction and inferior conjunction are terms used of the planets whose orbits are nearer to the sun than that of the earth, according as the sun is between us and them, or they between us and the sun. Research Conjunction
Harrison's timepiece was initially produced by John Harrison of Foulby in 1735 in response to a British government offer of reward in 1714 for methods of determining longitude at sea; to obviate the irregularities in the rate of timepieces by variations of temperature. A second and third timepiece followed and finally a fourth which won for Harrison the prize offered by the British government of 20,000 pounds sterling. Research Harrison's Timepiece
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Almanac
