A rule for the determination of the longitudes of the Sun and the Moon when they are in opposition or conjunction in longitude 1. One who wants to obtain (the longitudes of the Sun and the Moon when there is) euality in minutes of arc! should add as many minutes of arc as there are 20ruard ts, to the Sun's longitude (at sumrise) and the same together with the minutes of arc (of the difference between the longitude of the Sun as increased by 6 signs, and the longitude of the Moon in the case of opposition, or of the difference between the longitudes of the Sun and the Moon in the case of conjunction) to the Moon's longitude (when opposition or conjunction of the Sun and Moon is to occur); similarly, (when opposition or conjunc tion of the Sun and Moon has occurred) one should subtract the 2ratjud-tatऽ (etc. from the longitudes of the Sun and the Moon) In other words, if S and 4 denote the longitudes of the Sun and the Moon at sumrise on the full moon day, then Sun's longitude at the time of opposition of the Sun and Moon and Moon's longitude at the time of opposition of the Sun and Moon +(S+6 signs-4); and ifS' and M'denote the longitudes of the Sun and the Moon at sumrise on the new m00n day, then Sun's longitude at the time of conjunction of the Sun and Moon
- When the Sun and Moon are in opposition, their longitudes differ
by six signs; when they are in conjunction, their longitudes are the same. The minutes, however, are the same. The equality in minutes of arc refers here to the time ofopposition or conjunction.
