The Roman History · Amm. 20.3.7

Now let us come to the moon. The moon sustains a clear and visible eclipse when, being at the full, and exactly opposite to the sun, she is distant from his orb one hundred and eighty degrees, that is, is in the seventh sign; and although this happens at every full moon, still there is not always one eclipse.

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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