The following are the primary reasons why the sun of the spiritual world is seen at a middle elevation. First, this means that the warmth and light that emanate from that sun are at their median level—they are of equal proportions, therefore, and appropriately moderate. That is, if the sun appeared above that middle elevation, angels would perceive more warmth than light, while if it appeared lower, they would perceive more light than warmth, as happens on earth when the sun is above or below the middle of the sky. When it is above, the warmth increases more than the light; and when it is below, the light increases more than the warmth. The light actually stays the same in summer and winter, but the warmth increases or decreases depending on the degree of the sun’s height.
A second reason that the spiritual world’s sun appears at a middle height above the angelic heaven is that this results in a constant springtime for all the angelic heavens. Consequently, angels are in a state of peace, for this state corresponds to springtime on earth. A third reason is that it enables angels to turn their faces toward the Lord constantly and to see him with their eyes. For angels, the east—and therefore the Lord—is in front of them no matter which way they turn their bodies, which is a unique feature of their world. This would not happen if the sun of their world were above or below middle height, and it would be absolutely impossible if it were directly overhead.
If the spiritual world’s sun did not seem to be as far from angels as the physical world’s sun is from us, the whole angelic heaven, the hell underneath it, and our globe of lands and seas below them could not be under the Lord’s watchful guidance, omnipresence, omniscience, omnipotence, and providence. In the same way, if our world’s sun were not at the distance from the earth where we see it to be, it could not be present and effective with its warmth and light in all our lands, so it could not provide its subsidiary resources to the spiritual world’s sun.
It is of critical importance to realize that there are two suns, a spiritual one and a physical one, the spiritual sun for people who are in the spiritual world and the physical sun for people who are in the physical world. Unless this is recognized, there can be no real comprehension of creation or of humanity, subjects we are about to deal with. True, some effects can be seen, but unless the causes behind the effects are seen at the same time, it is like looking at the effects in the night.
from Divine Love and Wisdom, Sections 105-107