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).

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

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each other and each keeping its proper course, maintaining the relation of height between them and being in conjunction, as Ptolemy wisely and elegantly expresses it[*](μαθνηατικὴ σύνταξις, vi. 6.) have come to the points which in Greek we call ἀναβιβάζοντας and καταβιβάζοντας ἐκλειπτικοὶ σύνδεσμοι[*](Ascending and descending ecliptic nodes. The moon in its course shifts from one side to the other of the ecliptic, or sun’s course (see § 2, above). The nodes are the points where the moon passes the ecliptic; the node where she passes from the south to the north side is called ascending, that where she changes from north to south, descending. ) (that is, eclipse nodes). And if they merely graze the spaces adjacent to these nodes, the eclipse will be partial.

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.

Now it is thought that two suns are seen, if a cloud, raised higher than common and shining brightly from its nearness to the eternal fires,[*](I.e. the sun.) reflects a second brilliant orb, as if from a very clear mirror.

Let us now turn to the moon. Then only does she suffer a clear and evident eclipse, when, rounded out with her full light and opposite the sun, she is distant from its orb by 180 degrees (i.e. is in the seventh sign).[*](Of the Zodiac.) But although this happens at every full moon, yet there is not always an eclipse.

But since the moon is situated near the movement of the earth, and is the most remote from heaven of all that celestial beauty,[*](I.e. is nearer the earth than the other heavenly bodies.) she sometimes puts herself directly under the disc[*](The sun.) that strikes upon her, and

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is overshadowed and hidden for a time by the interposition of the goal of darkness ending in a narrow cone;[*](I.e. the shadow cast by the earth; meta refers to the shape of the shadow; cf. Cic., De Div. ii. 6, 17, quando illa. . . incurrat in umbram terrae, quae est meta noctis; Nat. Deor. ii. 40, 103.) and then she is wrapped in masses of darkness, when the sun, as if encompassed by the curve of the lower sphere, cannot light her with its rays, since the mass of the earth is between them; for that she has no light of her own has been assumed on various grounds.

And when under the same sign she meets the sun in a straight line, she is obscured (as was said) and her brightness is wholly dimmed; and this in Greek is called the moon’s σύνοδος.[*](Conjunction; cf. Plut., Quaest. Rom. 12, σύνοδος ἐκλειπτικὴ σελήνης πρὸς ἥλιον. That is, the time between two new moons; really, the last appearance of the waning moon, and the first of the actual new moon.)