After a certain time, solar temples, if built at all, would be oriented either to the sun at some critical time of the agricultural--or religious--year, or to the solstices and equinoxes. But at first, until the fixity of the sun's yearly movements and especially the solstices and equinoxes had been recognised, it would have seemed as useless to direct a temple to the sun as to the moon. After a time, however, when the solstices and equinoxes had been made out, it would soon have been found that a temple once directed to the sun's rising place at harvest or sowing time, or at a solstice or an equinox, would continue for a long period to mark those critical points in the sun's yearly course; and when this yearly course had been finally made out it would soon be observed that the sun at any part of the agricultural year was as constant (indeed, as we now know, more constant) in its rising-and setting-place as a star. But dealing with _sun_-worshippers, and endeavouring to think out what the earliest observers probably would try to do in the case of a _solar_ temple, we see that, in all likelihood, they would orient it to observe the sun at one of the chief points in the year which could be best marked. I have said "which could be best marked," but how was this to be done? Evidently, if terrestrial things were to be assisted, the marking must have been by something exterrestrial, otherwise they would have been reasoning in a circle; and moreover we must take for granted that what was wanted was a warning of what was to be done. Now, in the earliest times, as I have said, the constant movements of the stars would have stood out in strong contrast to the inconstant movements of the sun, and I think that there can be little doubt that the first fixing of any point in the year was by the rising or setting of some star at sunrise--or possibly sunset. It is obvious that this might have gone on even before the solstices and equinoxes were recognised. When this came about, then temples might have been directed to the sun at a solstice or an equinox. Was it difficult to do this? Did it indicate that the people who built such temples were great astronomers? Nothing of the kind; nothing is more easy to determine than a solstice or an equinox. Let us take the solstice first. We know that at the summer solstice the sun rises and sets furthest to the north, at the winter solstice furthest to the south. We have only from any point to set up a line of stakes before the time of the solstice, and then alter the line of them day by day as the sun gets further to the north or south, until no alteration is wanted. The solstice has been found.