A tutor to astronomie and geographie, or, An easie and speedy way to know the use of both the globes, coelestial and terrestrial in six books : the first teaching the rudiments of astronomy and geography, the 2. shewing by the globes the solution of astronomical & geographical probl., the 3. shewing by the globes the solution of problems in navigation, the 4. shewing by the globes the solution of astrological problemes, the 5. shewing by the globes the solution of gnomonical problemes, the 6. shewing by the globes the solution of of [sic] spherical triangles : more fully and amply then hath ever been set forth either by Gemma Frisius, Metius, Hues, Wright, Blaew, or any others that have taught the use of the globes : and that so plainly and methodically that the meanest capacity may at first reading apprehend it, and with a little practise grow expert in these divine sciences / by Joseph Moxon ; whereunto is added Antient poetical stories of the stars, shewing reasons why the several shapes and forms are pictured on the coelestial globe, collected from Dr. Hood ; as also a Discourse of the antiquity, progress and augmentation of astronomie.

PROB. X.

To make a North Erect Dyal declining Eastwards, or Westwards.

AS in Prob. 5. an Erect Direct North Dyal hath the same Delineation that an Erect Direct South Dyal hath, and differs only in the placing the Figures of the Hour lines: So a North Erect Dyal that declines Eastwards, or Westwards, differs from a South Erect Dyal that Declines Eastwards, or Westwards, the same number of degrees, only in placing the Hour lines at the same distance on the contrary side of the Plane, and by transposing the Figures of 11 for 1: 10 for 2: 9 for 3. &c.

Thus, if you draw upon Glass, Horn, or an Oyled Paper, the South Dyal Declining Eastwards, as in the foregoing Probleme,

and place it to its due scituation, the back side of it shall be a North Dyal declining towards the West so many degrees as the foreside Declines towards the East; and the only difference in it will be the Figures of the Hour lines; as was said before.