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.
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Title
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.
Author
Sturmy, Samuel, 1633-1669.
Publication
London :: Printed by E. Cotes for G. Hurlock, W. Fisher, E. Thomas, and D. Page ...,
1669.
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http://name.umdl.umich.edu/A61915.0001.001
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"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 June 15, 2024.
Pages
The Ʋse of the Nocturnal.
THe Use of the Nocturnal is easie and ready. Let the Tooth or Index of the mid∣dle Circle be set to the Day of the Month, and it will cut in the outward Circle the Sun's Place in the Ecliptique. Then hold the Instrument on high, a pretty distance from you, with the Foot AB right with the Horizon level: Then look through the Hole of the Center, and see the North-Star, turning the long Index or Pointer up∣wards or downwards, untill you see the brightest of the Guards over or under the Edge that comes straight to the Center. Then look on the Hour-Circle by the Edge of the Pointer, and it shews the Hour of the Night, and likewise the Point of the Com∣pass the Guard beareth from the Pole; by the which you may have his Declination by the following Tables exactly.
The Hour of the Night may be also found by the Right Ascension of the Sun and Stars. Thus, When that you see any Stars in the South, whose Right Ascension is known, and also the Right Ascension of the Sun for that day, you shall substract the Sun's Ascension from the Star's; that which remaineth divide by 15, to bring it into
descriptionPage 74
Hours;* 1.1 for 15 Degrees makes an Hour, and 4 Minutes make a Degree; thereby you have the Hour of the Night. If the Sun's Ascension be more than the Star's, in such case you shall add 360 Degrees to the Ascension of the Stars, and then substract the Sun's Ascension, as before directed, you have the time also.
Notes
* 1.1
Here place the North Nocturnal for the Pole Star and Guards