The Marquis Malvasia in his Ephemerides (Bologna, 1662) describes a micrometer of his own invention.
At a printing-press established in Walther's house by Regiomontanus, Purbach's Theoricae planetarum novae was published in 1472 or 1473; a series of popular calendars issued from it, and in 1474 a volume of Ephemerides calculated by Regiomontanus for thirty-two years (1474-1506), in which the method of "lunar distances," for determining the longitude at sea, was recommended and explained.
Written in 1766, it appeared in 1769-1770 in Dupont's journal, the Ephemerides du citoyen, and was published separately in 1776.
The ocean separating Europe from he was dependent upon dead reckoning, for although various methods for determining a longitude were known, the available astronomical ephemerides were not trustworthy, and errors of 30 in longitude were by no means rare.
He also published Narratio de Libris Revolutionum Copernici (Gedenum, 1540), which was subsequently added to editions of Copernicus's works; and Ephemerides until 1551, which were founded on the Copernican doctrines.
Casaubon, who Latinized its name " Dei ingenium (Ephemerides, 19th September 1611), was told by the " ornithotrophaeus " he visited at Wisbech that in London it fetched twenty pence.
The first, treating of agriculture and domestic economy, was the Journal economique (1751-1772); a Journal de commerce was founded in 1759; periodical biography may be first seen in the Necrologe des hommes celebres de France (1764-1782); the political economists established the Ephemerides du citoyen in 1765; the first Journal d'education was founded in 1768, and the Courrier de la mode in the same year; the theatre had its first organ in the Journal des theatres (1770); in the same year were produced a Journal de musique and the Encyclopedia militaire; the sister service was supplied with a Journal de marine in 1778.
The Ephemerides litterariae (1686) came out at Hamburg in Latin and French.
The first of a series of ephemerides, calculated on these principles, was published by him at Linz in 1617; and in that for 1620, dedicated to Baron Napier, he for the first time employed logarithms. This important invention was eagerly welcomed by him, and its theory formed the subject of a treatise entitled Chilias Logarithmorum, printed in 1624, but circulated in manuscript three years earlier, which largely contributed to bring the new method into general use in Germany.
In July 1628 Kepler accordingly arrived with his family at Sagan in Silesia, where he applied himself to the printing of his ephemerides up to the year 1636, and whence he issued, in 1629, a Notice to the Curious in Things Celestial, warning astronomers of approaching transits.
The present practice being the dominant one from the time of Ptolemy until the present, it was felt that the confusion in the combination of past and present astronomical observations, and the doubts and difficulties in using the astronomical ephemerides, formed a decisive argument against any change.
4, together constitute a catalogue of 3734 variable stars; ephemerides of over 800 variables are given in the Vierteljahrsschrift of the Astronomische Gesellschaft.
1844), the success of which led to his being summoned to Berlin in 1772 for the purpose of computing ephemerides on an improved plan.
To this school he rendered valuable service by several pamphlets on financial questions, and numerous articles representing and advocating its views in a popular style in the Journal de l'agriculture, du commerce, et des finances, and the Ephemerides du citoyen, of which he was successively editor.
At the international conference, which met at Paris in 1896 for the purpose of elaborating a common system of constants and fundamental stars to be employed in the various national ephemerides, Newcomb took a leading part, and at its suggestion undertook the task of determining a definite value of the constant of precession, and of 1 Lionville, t.
Such tables are used in the offices of the national Ephemerides to construct ephemerides of the several planets, showing their exact positions in the sky from day to day.
In the Ephemerides published year by year, the times of new moon were given, together with the calculated intervals to the first visibility of the crescent, from which the beginning of each month was reckoned; the dates and circumstances of solar and lunar eclipses were predicted; and due information was supplied as to the forthcoming heliacal risings and settings, conjunctions and oppositions of the planets.
Vi, of his Ephemerides, 1763); Lecons elementaires de Mathematiques (1741), frequently reprinted; ditto de Mecanique (1743), &c.; ditto d' Astronomie (146), 4th edition augmented by Lalande (1779); ditto d'Optique (1750), &c. Calculations by him of eclipses for eighteen hundred years were inserted in L' Art de verifi s r les dates (1750); he communicated to the Academy in 1755 a classed catalogue of fortytwo southern nebulae, and gave in t.
Of his Ephemerides (1755) practical rules for the employment of the lunar method of longitudes, proposing in his additions to Pierre Bouguer's Traite de Navigation (1760) the model of a nautical almanac.