Res Gestae
Ammianus Marcellinus
Ammianus Marcellinus. Ammianus Marcellinus, with an English translation, Vols. I-III. Rolfe, John C., translator. Cambridge, MA; London: Harvard University Press; W. Heinemann, 1935-1940 (printing).
At that same time, throughout the regions of the East the heaven was seen to be overcast with
This phenomenon never takes place so clearly as when the moon, after its shifting courses,[*](See note 2, p. 10, § 4, below.) brings back its monthly journey to the same starting-point after fixed intervals of time; that is to say, when the entire moon,[*](I.e. the full moon; cf. § 7, below.) in the abode of the same sign of the zodiac, is found in a perfectly straight line directly under the sun, and for a brief time stands still in the minute points which the science of geometry calls parts of parts.[*](I.e. parts of degrees, or minutes; cf. Pliny, N.H. ii. 48, scripulis partium. )
And although the revolutions and movements of both heavenly bodies, as the searchers[*](The natural philosophers.) for intelligible causes had observed, after the course of the moon is completed,[*](At the end of each lunar month.) meet at one and the same point always at the same distance from each other,[*](I.e. are in conjunction.) yet the sun is not always eclipsed at such times, but only when the moon (by a kind of fiery plumb-line)[*](According to Clark’s punctuation, based upon metrical clausulae (Introd., p. xxii); but igneo seems to be more naturally taken with orbi. ) is directly opposite the sun and interposed between its orb and our vision.
In short, the sun is hidden and his brightness suppressed, when he himself and the orb of the moon, the lowest of all the heavenly bodies, accompanying
If, on the other hand, they stand in the nodes themselves which closely unite the ascent and the descent, the heaven will be overcast with thicker darkness, so that because of the density of the air we cannot see even objects which are near and close at hand.