ABSTRACT
Of the eclipse, that thou mayest know on what day the moon I will become dark. The eclipse when it taketh place Fol. 232a. on the two hundred and seventh day. Reckon from the day wherein the eclipse took place, and where the two hundred and seven days agree. Direct thy attention, whilst thou art enquiring into the matter, to the fifteenth day of the moon, that is to say, to the day when the moon is full, and to what portion of the upper part of the Zodiac the· eclipse can take place. Now, if it be more than twelve parts distant, the eclipse cannot take place. Moreover, observe in what hour the fifteenth day cometh to an end, and the sixteenth day beginneth. And let this be kept by thee [in thy mind] with very great care, that is to say, .if the fifteenth day cometh to an end in the day-time, the eclipse is not visible, because it taketh place below the earth, but if the fifteenth day cometh to an end in the I night-time, and beginneth in the sixteenth day, know that Page 486 the eclipse is taking place above the earth, and it will therefore be plainly visible.
