A short treatise of dialling shewing, the making of all sorts of sun-dials, horizontal, erect, direct, declining, inclining, reclining; vpon any flat or plaine superficies, howsoeuer placed, with ruler and compasse onely, without any arithmeticall calculation. By Edvvard Wright.

CHAP. V. To finde the eleuation of the Meridian line aboue the Horizon. (Book 5)

THe Meridian line is either parallel to the Horizon, or else eleuated the one end* 1.1 higher then the other.

2 If the flat bee either horizontal, or East, or West, and inclining, or reclining, the meridi∣an is parallel to the Horizon.

3 In all other flats that disagree from the plaine of the Meridian circle, the Meridian line is eleuated the one end higher then the other.

4 This eleuation is either vpright, as in all erect* 1.2 Dials not declining 90. degrees, or else leaning, as in all inclining, and reclining flats not declining 90 degrees, which if they be direct, is equall to the complement of reclination, or inclination.

5 But if they decline, then the angle ABE. in the former figure, is the eleuation of the Meridian line.

6 If the meridian line bee not erect, it leaueth either Northwards, when the eleuated end there∣of* 1.3 looketh towards the North, or else Southwards when the eleuated end looketh towards the South.

7 All flats are either Polar (which being conti∣nued▪ would goe by the poles of the world) as all* 1.4 leaning flats, wherein the eleuation of the meridi∣an line is Northwards, and equall to the poles ele∣uation▪ and all erect decliners 90. degrees. Other∣wise they are no polar flats.* 1.5

Notes

• * 1.1

  How to finde the eleuation of the meridian line.
• * 1.2

  The eleuation of the meridian line in erect dials. In recli∣ning or incli∣ning direct flats; in recli∣ning or incli∣ning declining flats.
• * 1.3

  The eleuation of the meridian whether North or South.
• * 1.4

  Flats polar.
• * 1.5

  Not polar.