The reason for the eclipse of the sun from the moon is that if it is in its area, then as much as it covers it, it disappears from our sight. That shadow that we see in the sun is from the body of the moon, and it may obscure all of it, so the atmosphere is darkened and the eyes fall on the body of the moon, so the public imagines that that visible thing is the sun and the sun itself. It is bright in itself, as usual, until God wills it to be rounded. Therefore, the time of its eclipse and its magnitude are known to those who know the orbit of the planets, and it never occurs except at the end of the Arab month, for the moon at that time will be at waxing and burning under the ray. If the calculation gives what leads to the alignment with us, the eclipse will occur without a doubt. Likewise, the eclipse of the moon is only when the shadow of the Earth comes between it and the sun, so to the extent that it gets between them, the eclipse will be in that place, and for this it is kno