Not only of the sun, cried out aloud the philosopher Ammonius, who was there present, but also of the whole heaven; for, if the years really decrease, the passage which the sun makes from one tropic to another must of necessity be shortened, so that it shall not take up so great a part of the horizon as the mathematicians do imagine, but become less and shorter as the southern part approaches the northern. Whence consequently the summer will fall out to be shorter and the temperature of the air colder, by reason of the sun’s turning more inwardly, and describing greater parallels within the signs of the tropics than it now does in the longest day in summer and the shortest in winter. It would moreover also follow, that the pins of the dials in the city of Syene will no longer appear shadowless at the summer solstice, and some fixed stars will run under the horizon, and others against one another, for want of room. And should it be alleged that all the other celestial bodies keep their courses and ordinary motions without any change, they will never be able to cite any cause which shall hasten his motion alone above all the rest; but they will be forced to confound and disorder all evident appearances which do clearly show themselves to our eyes, and especially those of the moon. So that there will be no need of observing these measures of oil to know the difference of the years; because the eclipses will do this, if there be any, seeing the sun does oft meet with the moon, and the moon as oft falls within the shadow of the earth; so that we need not any longer hold arguing on this matter. But, says Cleombrotus, I myself have seen the measure of the oil, for they have shown it several years; but that of the present is far less than that of ancient times. Unto which Ammonius answered: How comes it to pass then that other people who have an inextinguishable fire in veneration, and have preserved it even time out of mind, could never remark this? And granting what you say concerning this measure of oil, is it not better to attribute the cause of this to some coldness or dampness of air; or, on the contrary, to some heat or dryness, by which the fire in the lamp being weakened needs not so much nourishment, and could not consume the same quantity? For it is well known that fire burns better in winter than in summer, its heat being drawn in and enclosed by the cold; whereas in great heats and dry weather it is weakened, lying dead and languishing without any strength; and if it be kindled in the sunshine, its efficacy is small, for it hardly catches hold of the wood, and slowly consumes the fuel. But we may with greater probability attribute the circumstance of the oil to the oil itself; for oil formerly was of less nutriment, as squeezed out of olives which grew upon young trees; but being since better ordered, as coming of plants more fully grown, it must needs be more effectual to the nourishing and keeping of the fire. And this is the best way of saving the credit of the Ammonian priests in their supposition, which will not endure the test of reason.