Dante and the early astronomers

by M. A. Orr

But in what sign was she? Her position in the zodiac is described in a peculiarly round-about fashion. Dante says that her course against the sky, that is, her monthly motion which is contrary to the diurnal, had taken her to that part of her track in which the sun is when from Rome he is seen to set between Sardinia and Corsica. The straits between these islands lie west and a little south of Rome, therefore the sun sets in that direction when he is going south after passing the autumnal equinox in Libra, and this is just what the moon is doing now. (The sun passes the same point again when coming north, before entering Aries at the spring equinox, but Dante has either forgotten this, or considers it obvious that the first position is meant here).

This is probably all that he means to convey, and if we ask for more exact information, it is almost impossible to tell what degree or even what sign in the zodiac he intends us to understand; for as the straits are nearly two hundred miles from Rome they are quite invisible thence, and we do not know what he thought was their precise direction. The mediæval commentator Benvenuto da Imola says that the position intended is in Scorpio; the moderns usually say Sagittarius, but without explaining how they draw this conclusion. Benvenuto’s is probably simply the position which he thought the moon ought to have in order to agree with what Dante says about her, just as he states that Venus was in Pisces in March 1300, although this was not the case at all, as we shall presently see.

A calculation based on the difference in latitude between Rome and the Straits shows that they are only about 9° south of west, and that the sun, when setting in this direction is about 6° south of the equator: this is the case 15 days after the equinox, which in the beginning of the fourteenth century fell on September 14. Therefore the date at which the sun was seen from Rome setting in the direction between Sardinia and Corsica was the 29th of September, and its position in the zodiac was then the middle of the sign Libra. (Owing to precession, it would be in the constellation Virgo, but we have seen that Dante ignores precession in these references.)

But the moon ought now, on this second night in Purgatory, to have reached at least the last degrees of Scorpio, since on the previous night she rose when the first part was already above the horizon. Dante has therefore made a flagrant mistake with his moon, running her back into Libra again, and falsifying all his previous descriptions—if he knew as much about geography as we do now. But it is only necessary to glance at the map of Henry of Mainz to see that such a supposition would be grotesque. The portolan maps did indeed show the relative positions of Rome, Sardinia, and Corsica, with remarkable accuracy;[474] but as we have already said, it is not in the least likely that Dante had ever seen one of these sailing charts. It was on the classics, and especially on Orosius, that he relied for his geography,[475] and the suggestion of Dr. Moore seems most plausible, that he was here thinking of the Spaniard’s description of Sardinia:—“Habet ab oriente et borea Tyrrenicum mare quod spectat ad portum urbis Romae.”[476] This implies that Sardinia lay south-west of Rome, in a direction such as the sun might have had when setting in November, in Scorpio or Sagittarius.

Or possibly, when the poet was in Rome in 1301, he may have been watching a sunset in the second week in November, and may have been told, among other pieces of misinformation which are so readily given to visitors to great cities, that he was looking towards the straits which separate Sardinia from Corsica. We can imagine his replying, or thinking: “Then the sun sets behind them when he has nearly finished his course in Scorpio, and is about to yoke his steeds under another star!”[477]

It is while the moon is shining on this Cornice that the spirits who purge their sins on it appear, rushing past in haste. Then at last Dante sleeps, and dreams again in the cold moonlit dawn when Aquarius and Pisces are on the horizon ([see p. 290]).

The mountain is full of daylight when Virgil wakes him, and the newly-risen sun shines behind them as they continue their journey, for they had reached the north point of the circle, and are walking now due west. They mount almost immediately to the Fifth Cornice, where presently they are startled by a violent trembling of the mountain followed by a mighty shout of “Gloria in excelsis” from all the spirits. Statius joins them, and from him they learn that this was no earthquake, for since passing the gate of Purgatory they are in a region too lofty for such disturbances to be felt, or for rain or snow or dew to fall; the mountain trembles, and the shout of praise follows, when a soul rises, purified and ready to ascend to Paradise. With Statius they climb to the Sixth Cornice, and then, looking round, they see that the fifth handmaid of the sun’s chariot is directing its upward course, that is, it is the fifth hour, or between 10 and 11 a.m. As usual, they walk on with the outer edge of the circle on their right. It is here that we are reminded, as once in the Inferno, that only a certain time is allowed, for while Dante is looking eagerly at the first mysterious tree Virgil gently urges him onward:—

“Lo più che padre mi dicea, Figliuole, Vienne oramai, chè il tempo che c’ è imposto Più utilmente compartir si vuole.”[478]

It is here also that Dante informs his old friend Forese Donati and other spirits, who are all astonished at the sight of his shadow, that he is a living man who was rescued by Virgil some days ago, when the sister of the sun was round (referring of course to the full moon in the forest), and he points to the sun. Now a curious question arises: Dante was in sunshine in the early morning; he is in sunshine now, and has been walking all morning in the same direction in which the sun was moving; how is it then that Statius did not notice his shadow, but had to be told that he was not a spirit?[479] If the Mountain had been a small hill, it would have been quite easy to walk so large a part of a circle round it, in a short time, that the poets would have been in shadow until the sun caught them up again when they lingered talking on the Sixth Cornice; but the Mountain was so large that a whole day’s walking only brought them a quarter of the way round, i.e. from the east side to the north, and it was evidently a distance of many miles.[480] It is difficult to believe that Dante has forgotten, because he is so careful throughout to mention the surprise of the spirits except when his shadow could not be seen for one reason or another. It is true that in the latitude of Purgatory (32° south, as that of Jerusalem is 32° north), the sun rises rather steeply, which makes it easier to get into the shade in the early morning while circling a mountain.[481] On the other hand a simpler solution offers itself in the text. Statius approaches Dante and Virgil from behind, and they only stop and turn their faces to him for a few moments while Virgil returns his greeting, then walk on quickly while Statius makes his surprised reply: “What! if you are spirits....” If he has not yet quite overtaken them he cannot see Dante’s shadow, which Dante himself is screening from view as it falls in front of him, the morning sun being still at his back, and Virgil explains at once that his companion is a living man.

In spite of their haste, the three poets remain about four hours in this sixth Cornice; and when they reach the ascent to the next it was indeed time to climb without any delay, for the sun had left the meridian to the sign which follows Aries, viz. Taurus, and Night, “che opposita a lui cerchia,”[482] had left the meridian of the opposite hemisphere to Scorpio. Aries at the time of the equinox begins to cross the meridian at midday, Taurus at two o’clock, and Gemini at four[483]: therefore it is now between two and four in the afternoon. The three poets hasten therefore (Statius still accompanying Virgil and Dante), like men who pause for nothing on their way, whatever the road be like; and a question Dante is longing to ask with regard to the form of purgation last seen is put and answered as they follow one another up the narrow stair; as soon as they reach the top, they turn to the right, as usual, without hesitation or delay. As Dante walks cautiously between the outer edge of this Cornice and the fire which bursts forth from the inner wall of rock, all the blue of the western sky is already changing into ash-white, and he has come so far round the Mountain that the evening rays strike his right shoulder. With one of the many touches which show Dante’s close observation and his vivid realization of the scene he is describing, he says here that his shadow falling on the flame makes it appear a deeper red, and this is observed by the spirits. When they reach the spot where, on the further side of the flames, the chanting Angel guides them across to the last ascent, the sun is very near to its setting. Its burning noonday beams are shining on the waves of Ganges, its first morning beams quiver over Jerusalem, and Spain lying under Libra is wrapped in midnight gloom; hence it is beginning to set at sea-level in Purgatory. High on the Mountain it still shines, but when the poets have crossed the flames, the voice of the Angel persuades them to hasten their steps before the darkness comes. The stair mounts through the rock on the west side of the Mountain so that the low sun casts Dante’s shadow in front of him as he climbs. And he has only climbed a few steps when they are all aware that the sun has completely set because the shadow disappears. Before the colour has all faded from the west, and the whole vast range of the horizon seen from this height has become one uniform tint, each of the three makes a bed of one step, and between the high and narrow enclosing rocky walls Dante sees the stars come out, much brighter and much larger than he has ever seen them before. No moonlight dims them, for moonrise will be late to-night, long after Dante has fallen asleep.