4. To finde the Angle of 6 from 12.

Take the plaines declination from the particular scale of altitudes, and lay it from 90 on the Azimuth scale, and to the Compasses point lay the thread: then on the line of de∣grees you have the complement of 6 from 12, counting from 60 toward the end.

Page  42 Note this Rule (as this line is drawn) doth not give this Angle ex∣actly, neither will it be worth the while to delineate another line for this purpose. But if it be re∣quired it may be done, but I rather prefer this help, the greatest error is about the space of 45 minutes of the first degree in the particular scale of altitudes; so that if you conceive those 45 minutes to be divided as the particular scale of altitudes is, like a natural sine, and if your declina∣tion be 30, then take half the space of the 45 minutes less, and that shall be the true distance to lay on the Azimuth line from 90 whereunto to lay the thread.