105. The Sun of the spiritual world appears in the middle altitude chiefly for the following reasons. First, the heat and light which come forth from that Sun are thus in their middle degree, and hence in equal proportion and so are rightly tempered. For if the Sun appeared above the middle altitude, more heat than light would be perceived, and if below it, more light than heat would be perceived as happens on the earth when the sun is above or below the middle of the sky. When it is above, there is an increase of heat over light, but when below, an increase of light over heat; for light remains the same in summer and in winter, but heat increases or diminishes according to the degrees of the sun's altitude. The second reason that the Sun of the spiritual world appears in the middle altitude above the angelic heaven is that there is that perpetual spring in all the angelic heavens from which the angels are in a state of peace, for this state corresponds to springtime on earth. The third reason is that the angels are thus able to turn their faces continually towards the Lord and see 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. This would not happen if the Sun of that world appeared above or below the middle, and least of all if it appeared overhead in the zenith.