"The south altar, the most important of all Chinese religious structures, has the following dimensions: It consists of a triple circular terrace, 210 feet wide at the base, 150 in the middle, and 90 at the top. In these, notice the multiples of three: 3 × 3 = 9, 3 × 5 = 15, 3 × 7 = 21. The heights of the three terraces, upper, middle, and lower, are 5·72 feet, 6·23 feet, and 5 feet respectively. At the times of sacrificing, the tablets to heaven and to the Emperor's ancestors are placed on the top; they are 2 feet 5 inches long, and 5 inches wide. The title is in gilt letters; that of heaven faces the south, and those of the ancestors east and west. The Emperor, with his immediate suite, kneels in front of the tablet of Shang-Ti and faces the north. The platform is laid with marble stones, forming nine concentric circles; the inner circle consists of nine stones, cut so as to fit with close edges round the central stone, which is a perfect circle. Here the Emperor kneels, and is surrounded first by the circles of the terraces and their enclosing walls, and then by the circle of the horizon. He thus seems to himself and his court to be in the centre of the universe, and turning to the north, assuming the attitude of a subject, he acknowledges in prayer and by his position that he is inferior to heaven, and to heaven alone. Round him on the pavement are the nine circles of as many heavens, consisting of nine stones, then eighteen, then twenty-seven, and so on in successive multiples of nine till the square of nine, the favourite number of Chinese philosophy, is reached in the outermost circle of eighty-one stones. "The same symbolism is carried throughout the balustrades, the steps, and the two lower terraces of the altar. Four flights of steps of nine each lead down to the middle terrace, where are placed the tablets to the spirits of the sun, moon, and stars and the year god, Tai-sui. The sun and stars take the east, and the moon and Tai-sui the west: the stars are the twenty-eight constellations of the Chinese zodiac, borrowed by the Hindoos soon after the Christian era, and called by them the Naksha-tras; the Tai-sui is a deification of the sixty-year cycle."[14] We find, then, that, the most important temple in China is oriented to the winter solstice. To mention another instance. It has long been known that Stonehenge is oriented to the rising of the sun at, the summer solstice. Its amplitude instead of being 26° is 40° N. of E.; with a latitude of 51°, the 26° azimuth of Thebes is represented by an amplitude of 40° at Stonehenge. The structure consists of a double circle of stones, with a sort of naos composed of large stones facing a so-called avenue, which is a sunken way between two parallel banks. This avenue stretches away from the naos in the direction of the solstitial sunrise.