The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.

About this Item

Title

Author

Sturmy, Samuel, 1633-1669.

Publication

London :: Printed by E. Cotes for G. Hurlock, W. Fisher, E. Thomas, and D. Page ...,

1669.

Rights/Permissions

To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication ( http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.

This text has been selected for inclusion in the EEBO-TCP: Navigations collection, funded by the National Endowment for the Humanities.

Link to this Item

http://name.umdl.umich.edu/A61915.0001.001

Cite this Item

"The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A61915.0001.001. University of Michigan Library Digital Collections. Accessed May 7, 2025.

Pages

PROBL. IX. The Elevation of the Pole, and the Declination of the Sun being given; to find the Suns Altitude when he is due East and West.

MEasure the extent CM on the Vertical-Circle, and apply it to the Line of Signs, and it will reach to 26 degr. 36 min. or the same distance taken of the Concave-Sphere, and applyed to the Line of ½ Tangents, shews the same number, and so much is his Altitude sought in Summer; but when he hath the like Declination South, then so much is his Depression under the Horizon in Winter, when he is East and West; if the Suns Parallel of Declination TM doth not meet with the prime Vertical Circle CZ, the Sun cometh not to the East and West, as it happeneth many times in small Latitudes, or Countreys betwixt the Tropicks.

In the former Diagram, the Suns Altitude when he is due East and West, is shewed by the Arch CM, wherefore in the Triangle CVM we have given, (1) the Suns De∣clination VM 20 degr. 30 min. (2) the Angle of the Poles Elevation MCV 51 deg. 28 min. to find his Altitude CM; I say,

This Rule will hold by the Artificial Lines, of Signs and Tangents.	As the Sign of the Angle of Latit. 51 d. 28 m. UCM	989334
is to the Sign of the Declin. 20 degr. 30 min. UM	954432
So is the Radius 90 degr.	10
to the Sign of the Altitude 26 deg. 37 min. CM	965098