The Roman History · Amm. 26.1.8

The ancients who were skilled in the motions of the world and the stars, among whom the most eminent are Meton, Euctemon, Hipparchus, and Archimedes, define it as the period of the revolving year when the sun, in accordance with the laws which regulate the heavens, having gone through the zodiac, in three hundred and sixty-five days and nights, returns to the same point: as, for instance, when, after having moved on from the second degree of the Ram, it returns again to it after having completed its circuit.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
Passage preview. Read in context for the complete text, notes and references.