The era of the Chinese monarchy has been variously fixed from 2952 to 2132 years before Christ; and the year 2637 has been chosen for the lawful epoch by the authority of the present emperor. The difference arises from the uncertain duration of the two first dynasties; and the vacant space that lies beyond them, as far as the real, or fabulous, times of Fohi or Hoangti Sematsien dates his authentic chronology from the year 841: the thirty-six eclipses of Confucius (thirty-one of which have been verified) were observed between the years 722 and 480 before Christ. The historical period of China does not ascend above the Greek Olympiads.