I don't want to sound presumptuous but I think this is not difficult to understand. I told it in another thread.
In You are not allowed to view links.
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Login to view. are drawn the planetary aspects of astrology. In the middle part we see two suns and two moons because the moon moves in another circle and sometimes goes in front of the sun and sometimes behind. The diagram serves to explain the planetary aspects, which are drawn in the corners with the heads of the sun and the moon
Here is the trine:
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Here the sextile:
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Here the square
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And here the conjuction and the opposition. The little head in the middle is the earth, which is drawn with a pointed hat to represent the shadow of the eclipse when there is opposition between the sun and the moon.
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They are the major planetary aspects. Here they are represented in relation to the sun and the moon, considered planets in the middle ages. We can see these aspects outlined in many volvelles, as in this
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