Scripta clarissimi mathematici M. Ioannis Regiomontani, de torqueto, astrolabio armillari, regula magna ptolemaica, baculo[que] astronomico, & observationibus cometarum, aucta necessariis, Ioannis Schoneri ... additionibus. Item observationes motuum solis, ac stellarum tam fixarum [qua ...] erraticarum. Item libellus M. Georgii Purbachii de quadrato geometrico ...

of the true Sun in the ecliptic sign-bearer; for thus all the circles that constitute the instrument will be like the celestial circles, just as we interpreted before.

With both luminaries constituted in the upper hemisphere, fashion the figure of the sky through the inspection of the Sun, just as we taught a little earlier. Then rotate the crest to and fro until, with your eye applied to the circle of latitude, the lunar globe is seen to be split through the middle; and immediately raise or lower the ruler of latitude until the Moon is seen through the middle holes of the ruler itself. For then the head of the ruler of longitude will indicate the visual place of the Moon in the ecliptic sign-bearer. The head of the ruler of latitude will show the seen latitude of the Moon on the margin of its circle. What denomination that latitude receives, the head of the mentioned ruler will teach, if you observe on which part of the circle of latitude, namely Northern or Southern, it is situated. But if the Moon is removed by equal intervals from the horoscope and the western pivot, and therefore suffers no diversity of aspect, do not doubt that you have found the place of the Moon according to the longitude of the zodiac, the indication of which position the hanging semicircle will provide whenever it is equidistant to the circle of latitude. You will detect that position much more certainly if you have learned the ascending degree, as will be taught below, at the hour of your consideration.

Here