The Roman History · Amm. 26.1.10

Now as the beginning of each year varies, one commencing at the sixth hour of the day, another at the same hour of the night, to prevent the calculation from throwing all science into confusion by its perplexing diversity, and the months of autumn from sometimes being found to come in the spring, it has been settled that those six hours which in a period of four years amount to twenty-four shall be put together so as to make one day and night.

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
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