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

v2.p.11

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.