105. The sun of the spiritual world appears at a middle altitude chiefly for the following reasons: First, the heat and light which proceed from that sun are thus at their medium intensity, consequently are equally proportioned and thus properly attempered. For if the sun were to appear above the middle altitude more heat than light would be perceived, if below it more light than heat; as is the case on earth when the sun is above or below the middle of the sky; when above, the heat increases beyond the light, when below, the light increases beyond the heat; for light remains the same in summer and in winter, but heat increases and diminishes according to the degree of the sun's altitude. Secondly, the sun of the spiritual world appears in a middle altitude above the angelic heaven, because there is thus a perpetual spring in all the angelic heavens, whereby the angels are in a state of peace; for this state corresponds to springtime on earth. Thirdly, angels are thus enabled to turn their faces constantly to the Lord, and behold Him with their eyes. For at every turn of their bodies, the angels have the east, thus the Lord, before their faces. This is peculiar to that world, and would not be the case if the sun of that world were to appear above or below the middle altitude, and least of all if it were to appear overhead in the zenith.