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26Since there was to be an eclipse of the sun on his birthday, he feared that there might be some disturbance in consequence, inasmuch as some other portents had already occurred; he therefore issued a proclamation in which he stated not only the fact that there was to be an eclipse, and when, and for how long, but also the reasons for which this was bound to happen. 2These reasons I will now give. The moon, which revolves in its orbit below the sun (or so it is believed), either directly below it or perhaps with Mercury and Venus intervening, has a longitudinal motion, just as the sun has, and a vertical motion, as the other perhaps likewise has, but it has also a latitudinal motion such as the sun never shows under any conditions. 3When, therefore, the moon gets in a direct line with the sun over our heads and passes under its blazing orb, it obscures the rays from that body that extend toward the earth. To some of the earth’s inhabitants this obscuration lasts for a longer and to others for a shorter time, whereas to still others it does not occur for even the briefest moment. 4For since the sun always has a light of its own, it is never deprived of it, and consequently to all those between whom and the sun the moon does not pass, so as to throw a shadow over it, it always appears entire. This, then, is what happens to the sun, and it was made public by Claudius at that time. 5But now that I have once touched upon this subject, it will not be out of place to give the explanation of a lunar eclipse also. Whenever, then, the moon gets directly opposite the sun (for it is eclipsed only at full moon, just as the sun is eclipsed at the time of new moon) and runs into the cone-shaped shadow of the earth, a thing that happens whenever it passes through the mean point in its latitudinal motion, it is then deprived of the sun’s light and appears by itself just as it really is. Such is the explanation of these phenomena.
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