|Author:||Oughtred, William, 1575-1660.|
|Title:||The description and use of the double horizontall dyall|
|Publication info:||Ann Arbor, Michigan: University of Michigan, Digital Library Production Service
2011 December (TCP phase 2)
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The description and use of the double horizontall dyall
Oughtred, William, 1575-1660.
London: Printed by M. Flesher, M DC XXXII 
Dedication (from t.p.): To the most noble, and hopeful gentleman, Sr. William Hovvard Knight of the Bath, and sonne to the right honorable and illustrious lord, Thomas, Earle of Arundel and Surrey, Earle Marshal of England, &c.
Reproduction of original in: Harvard University. Library.
Sun-dials -- Early works to 1800.
The description, and use of the double Horizontall diall.
II use. To finde the declination of the sunne every day.
III. Vse. To find the diurnall arch, or circle of the sunnes course every day.
IIII. Vse. To find the rising and setting of the sunne every day.
V. use. To know the reason and manner of the In∣treasing and decreasing of the dayes & nights throughout the whole yeare:
VI. Vse. To find how farre the sunne riseth, and setteth from the true East and west points, which is called the sunnes. Amplitude ortive; and occasive.
VII. Vse. To finde the length of every day and night.
VIII. Vse. To finde the true place of the sunne upon the diall, that is, the point of the instrument which answe∣reth to the place of the sunne in the heavens at any time. which is the very ground of all the questions following.
IX. Vse. To find the hower of the day.
X. Vse. To find out the Meridian, and other points of the compasse.
XI. Vse. To find out the Azumith of the sunne, that is the distance of the Ʋerticall circle, in which the sunne is at that present, from the Meridian.
XII Vse. To find out the Declination of any Wall upon which the sunne shineth, that it, how farre that wall swerveth from the North or South, either Eastward or Westward.
XIII. Vse. How to place the dyall upon a post without any other direction but it selfe.
XIIII. Vse. To find the height of the Sun at high noone every day.
XV. Vse. To find the height of the sunne at any hower or time of the day.
XVI. Vse The height of the sunne being given to finde out the hower, or what it is a clocke.
XVII. Vse. Considerations for the use of the instru∣ment in the night.
XVIII. Vse. To find how many degrees the sunne is under the horizon at any time of the night.
XIX. Vse. To find out the length of the Crepusculum, or twylight, every day.
XX. Vse. If the day of the month be not knowne, to find it out by the dyall.