Called also Fílbus or Filḳus. It is also known as the Era of Alex­ander of Macedon. It dates from his death. The years and months are artificial, solar. Theon of Alexandria has based his calculations of the mean places of the stars in his Canon on this Era, and Ptolemy has recorded some of his observations regarding it, in the Almagest. Of this period, 1,917 years have elapsed.