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To find the Dominical Letter, take the year and its fourth part, and add them together; divide the fum by 7, and subtract what remains, after that division, from the divisor 7, the remainder gives the answer, accounting the letter A for 1, B for 2, C for 3, D for 4, E for 5, F for 6, and G for 7.

The Dominical Letter for 1800 is found thus : The year and its fourth 450 make 2250. After this sum is divided by 7; there remains 3, which subtracted from 7 leaves 4 for a remainder, which is the Dominical Letter for the year 1800.

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Period is a series, or circle, of a certain num.

ber of years, used for measuring or computing time. Of these there are several, most of which take their names from the persons who invented them.

Of the Meronic period, or lunar cycle of 19 years, it is needless to say any thing more. It has been sufficiently explained.

The

The Calippic period, so called from its inventor Calippus, is a series of 76-years, which being elapsed, Calippus supposed that the new and full moons would return to the same day of the folár year. This was intended as an improvement of the Metonic period.

The Viktorian period is a feries of 532 years, arifing from the cycles of the fun and moon' multiplied into one another. ' It was 'invented' by Vicida rius, a French clergyman, about the middle of the 5th century, and used by the western churches for many ages, in computing the time of Easter, till the Gregorian reformation of the calendar..

The famous Julian period is a series of 7980 years, arising from the multiplication of the cycles of the sun, moon, and indiction into one another. This period is said to have been invented by Joseph Scaliger; and is called Julian, “as being adapted to the Julian year:

As it commences before the crea

0122 tion, and will wants

wants above 1500 years of being ju:D gerefore 2 it

cycles periods, and epochas, and, in short, the times of all actions and events, from the beginning of the world. Being thus a common receptacle, as it were, of all other epocha's, it is of great use in reducing the fears

of "aħy" given épocha to those of another ; for which purpose it was intented.

снА Р.

C H A P. LXII.

OF EPOCHAS OR ARAS.

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AN Epocha, or £ra

, is a certain fixed point of time, made famous by some remarkable event ; from whence, as from a root, the ensuing years are numbered or computed.

As there is no astronomical consideration to render one epocha.preferable to another, their conftitution is purely, arbitrary, and therefore various epochas have been used at different times, and among different nations. ]

· The Christian epocha is the common epocha throughout Europe, commencing on the 25th of December, the day of our Saviour's nativity; or rather, according to the usual account, from his circumcision, on the 'ist' of January. In those countries, which observe the Julian calendar, it commences from the incarnation, on the 25th of March, nine months prior to the nativity.

The author of this epocha, or way of computing from Christ, was. Dionyfius Exiguus, a Roman abbot, about the beginning of the fixth century. Till his time the Christians computed their years, either from the persecution under Dioclefian, or

from

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from the building of Rome, or according to the custom of the people among whom they lived.

The calculations, however, of our modern astronomers, seem plainly to prove that the Dionysian account places the birth of our Saviour several years too late. But that is not material.

The Epocha of the Creation, according to the Jewish computation, is the year of the Julian period 953, answering to the year before Christ 3761, and commencing on the 7th of October. Hence, if we subtract 952 from any given year of the Julian period, the remainder is the corresponding year of the Jewith epocha of the creation.

The Epocha of the Olympiads, which was used principally by the Greeks, is very famous in ancient history. It took its rise from the Olympic games, which were celebrated at the beginning of every fifth year, near Olympia, a city of Elis in Peloponnesus. An Olympiad, therefore, was a period of four years, and by these periods the Greeks seckoned their time, the year in which the games were celebrated being counted the first year of each Olympiad

The beginning of the first Olympiad is referred to the year of the Julian period 3938, of 776 years before Chrift.

The

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The Epocha of the building of Rome, was the principal one among the Romans. This epocha is the year of the Julian period 3961, and answers to the year 752 before Christ, commencing on the 21st of April.

The Dioc’esian Epocha, or Epocha of the Martyrs, coinmences in the year of Christ 284, and that of the Julian period 4997. It obtained its name from the great number of Christians who suffered martyrdom in the reign of the emperor Dioclefian ; and was generally used by Christians till the year 532, when the way of computing from the birth of Christ began to prevail. : The Epocha of the Hegira is used by the Turks, Arabs, and others who profefs the Mahometan faith. It commences on the 16th of July, in the year of Christ 622, and of the Julian period 5335. The word Hegira fignifies flight; the event which gave occasion to this epocha being Mahomet's flight from Mecca. The magistrates of that city, finding that his imposture tended to difturb the public peace, were determined to cut off the author of it, to prevent the farther spreading of the mischief. But Mahomet, having timely notice of their design, fed by night to Medina, another city of Arabia, in the year

of our Lord above-mentioned; and this is

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