a branch of colmography, which describes the moon and all the parts and appearances thereof, as geography does those of the earth.

SELEUCIDÆ, in chronology. Era of the Seleucidæ, or the Syro-macedonian era, is a computation of time commencing from the establishment of the Seleucidæ, a race of Greek kings, who reigned as successors of Alexander the Great in Syria, as the Ptolemies did in Egypt. This era we find expressed in the book of the Maccabees, and on a great number of Greek medals struck by the cities of Syria, &c. The Rabbins call it the era of contracts; and the Arabs, Therik dilkarnain, that is, the era of the two horns. According to the best accounts, the first year. year of this era falls in the year 311 before Chr., being twelve years after Alexander's death.