When fire’s red flower was flown, and spent the flames,
Which smoothed the embers.
For burning matter is evidently not fire but a body submitted to fire, and altered by it, which fire is attached to a solid stable mass and is permanent there, whereas flames are the kindling |C| and streaming away of rarefied fuel which is quickly dissolved because it is weak.
‘Thus no such clear proof could exist that the moon is earth-like and dense, as this cinder-like colour, if it really were her own proper colour. But it is not so, dear Pharnaces; in the course of an eclipse she goes through many changes of complexion, and scientific men divide these accordingly by time and hour. If she is eclipsed at early evening, she appears strangely black till three and a half hours have elapsed; if at midnight, she emits that red and flame-like hue over her surface which we know; after seven and a half hours the redness begins to be removed, and at last towards dawn she takes a bluish or light-grey hue, |D| which is the real reason why poets and Empedocles invoke her as “grey-eyed”. Now, people who see the moon assume so many hues as she passes through the shadow do wrong in fastening upon one, the cinder-like, which may be called the one most foreign to her, being rather an admixture and remnant of light which shines round her through the shadows, than her own peculiar complexion, which is black and earth-like. But whereas we see on our earth that places in shadow which are near purple or scarlet cloths, or near lakes, or rivers open to the sun, partake in the brilliance of these colours and offer many varied splendours because of the reflexions, what wonder |E| if a great stream of shadow, falling upon a celestial sea of light, not stable or calm but agitated by myriads of stars and admitting of combinations and changes of every kind, presents to us different colours at different times impressed on it by the moon? For a star or a fire could not show when in shadow as black or grey or blue. But our hills and plains and seas are coursed over by many-coloured shapes coming from the sun and |F| by shadows also and mists, resembling the hues produced by white light over a painter’s pigments. For those seen on the sea Homer has endeavoured to find such names as he could, as “violet” for the sea, and “wine-dark” and again “purple wave”, and elsewhere “grey sea” and “white calm”. But the varying colours which appear on land at different times he has passed over as being infinite in number. Now, it is not likely that the moon has one surface as the sea has, but rather that she resembles in substance the earth, of which Socrates[[348]] |935| of old used to tell the legend, whether he hinted at the moon, or meant some other body. For it is nothing incredible or wonderful if, having nothing corrupt or muddy in her, but enjoying light from heaven, and being stored with a heat not burning or furious, but mild and harmless and natural, she possesses regions of marvellous beauty, hills clear as flame, and belts of purple, her gold and silver not dispersed within her depths, but flowering forth on the plains in plenty, or set |B| around smooth eminences. Now, if a varying view of these reaches us from time to time through the shadow, owing to some change and shifting of the surrounding air, surely the moon does not lose her honour or her fame, nor yet her Divinity, when she is held by men to be holy earth of a sort and not, as the Stoics say, fire which is turbid, mere dregs of fire. Fire is honoured in barbarous fashions by the Medes and Assyrians, who fear what injures them, and pay observance or rites of propitiation to that, rather than to what they revere. But the name of earth, we know, is dear and honourable to every Greek, we reverence her as our fathers did, like any other God. But, being men, we are very far from thinking of the moon, that |C| Olympian earth, as a body without soul or mind, having no share in things which we duly offer as first-fruits to the Gods, taught by usage to pay them a return for the goods they give us, and by Nature to reverence that which is above ourselves in virtue and power and honour. Let us not then think that we offend in holding that she is an earth, and that this her visible face, just like our earth with its great gulfs, is folded back into great depths and clefts containing water or murky air, which the light of the sun fails to penetrate or touch, but is obscured, and sends back its reflexion here in shattered fragments.’
XXII. Here Apollonides broke in: ‘Then in the name of |D| the moon herself,’ he said, ‘do you think it possible that shadows are thrown there by any clefts or gullies, and from thence reach our sight, or do you not calculate what follows, and am I to tell you? Pray hear me out, though you know it all. The diameter of the moon shows an apparent breadth of twelve fingers at her mean distance from us. Now, each of those black shadowy objects appears larger than half a finger, and is therefore more than a twenty-fourth part of the diameter. |E| Very well; if we were to assume the circumference of the moon to be only thirty thousand stades, and the diameter ten thousand, on that assumption each of these shadowy objects on her would be not less than five hundred stades. Now, consider first whether it be possible for the moon to have depths and eminences sufficient to cause a shadow of that size. Next, if they are so large, how is it that we do not see them?’
At this, I smiled on him and said, ‘Well done, Apollonides, to have found out such a demonstration! By it you will prove that you and I too are greater than the Aloades[[349]] of old, not |F| at any time of day, however, but in early morning for choice, and late afternoon; when the sun makes our shadows prodigious, and thereby presents to our sense the splendid inference, that if the shadow thrown be great, the object which throws it is enormous. Neither of us, I am sure, has ever been in Lemnos, but we have both heard the familiar line,[[350]]
Athos the Lemnian heifer’s flank shall shade.
For the shadow of the cliff falls, it seems, on a certain brazen |936| heifer over a stretch of sea of not less than seven hundred stades. Will you think then that the height which casts the shadow is the cause, forgetting that distance of the light from objects makes their shadows many times longer? Now consider the sun at his greatest distance from the moon, when she is at the full, and shows the features of the face most expressly because of the depth of the shadow; it is the mere distance of the light which has made the shadow large, not the size of the several |B| irregularities on the moon. Again, in full day the extreme brightness of the sun’s rays does not allow the tops of mountains to be seen, but deep and hollow places appear from a long distance, as also do those in shadow. There is nothing strange then if it is not possible to see precisely how the moon too is caught by the light, and illuminated, and yet if we do see by contrast where the parts in shadow lie near the bright parts.
XXIII. ‘But here’, said I, ‘is a better point to disprove the alleged reflexion from the moon; it is found that those who stand in reflected rays, not only see the illuminated but also the illuminating body. For instance, when light from water |C| leaps on to a wall, and the eye is placed in the spot so illuminated by reflexion, it sees the three objects, the reflected rays, the water which caused the reflexion, and the sun himself, from whom proceeds the light so falling on the water and reflected. All this being granted and apparent, people require those who contend that the earth receives the moon’s light by reflexion, to point out the sun appearing in the moon at night, as he appears in the water by day when he is reflected off it. Then, as he does not so appear, they suppose that the illumination is caused by some process other than reflexion, and that, failing reflexion, |D| the moon is no earth.’
‘What answer then is to be given to them?’ said Apollonides, ‘for the difficulty about reflexion seems to apply equally to us.’ ‘Equally no doubt in one sense,’ I answered, ‘but in another sense not at all so. First look at the details of the simile, how “topsy turvy”[[351]] it is, rivers flowing up stream! The water is below and on earth, the moon is above the earth and poised aloft. So the angles of reflexion are differently formed; in the one case the apex is above in the moon, in the other below on the earth. They should not then require that mirrors should produce every image and like reflexions at any distance, since |E| they are fighting against clear fact. But from those like ourselves who seek to show that the moon is not a fine smooth substance like water, but heavy and earth-like, it is strange to ask for a visible appearance of the sun in her. Why, milk does not return such mirrored images, nor produce optical reflexion, the reason being the unevenness and roughness of its parts. How can the moon possibly send back the vision off |F| herself as the smoother mirrors do? We know that even in these, if any scratch or speck or roughness is found at the point from which the vision is naturally reflected it is obscured; the blemishes are seen, but they do not return the light. A man who requires that she should either turn our vision back to the sun, or else not reflect the sun from herself to us, is a humorist; he wants our eye to be the sun, the image light, man heaven! That the reflexion of the sun’s light conveyed to the moon with the impact of his intense brilliance should be borne back to us is reasonable enough, whereas our sight is weak and slight and merely fractional. What wonder if it deliver a stroke which has no resilience, or, if it does rebound, no continuity, but is broken up and fails, having no store of light to make up for dispersion about the rough and uneven |937| places. For it is not impossible that the reflexion should rebound to the sun from water and other mirrors, being still strong and near its point of origin; whereas from the moon, even if there are glancings of a sort, yet they will be weak and dim, and will fail by the way because of the long distance. Another point: concave mirrors return the reflected light in greater strength than the original, and thus often produce |B| flames; convex and spherical mirrors one which is weak and dim, because the pressure is not returned from all parts of the surface. You have seen, no doubt, how when two rainbows appear, one cloud enfolding another, the enveloping bow shows the colours dim and indistinct, for the outer cloud lying further from the eye does not return the reflexion in strength or intensity. But enough! Whereas the light of the sun reflected from the moon loses its heat entirely, and only a scanty and ineffectual remnant of its brilliance reaches us, do you really think it possible that when sight has the double course to travel, |C| any remnant whatever should reach the sun from the moon? No! say I. Look for yourselves’, I went on. ‘If the effects of the water and of the moon on our sight were the same, the full moon ought to show us images of earth and plants and men and stars, as other mirrors do. If, on the other hand, our vision is never carried back on to these objects, whether because of its own feebleness or of the roughness of the moon’s surface, then let us never demand that it should be carried by reflexion on to the sun.