The Roman History · Amm. 25.10.3

For some think they have received the name because they scatter fire wreathed like hair by a number of stars being collected into one mass; others think that they derive their fire from the dry evaporation of the earth rising gradually to a greater height; some fancy that the sunbeams as they rapidly pass, being prevented by dense clouds from descending lower, by infusing their brilliancy into a dense body show a light which, as it were, seems spotted with stars to the eyes of mortals. Some again have a fixed opinion that this kind of light is visible when some cloud, rising to a greater height than usual, becomes illuminated by its proximity to the eternal fires; or, that at all events there are some stars like the rest, of which the special times of their rising and setting are not understood by man. There are many other suggestions about comets which have been put forth by men…

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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