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There's nothing mystical or complicated about a sextant. All it is is a device that measures the angle between two objects. The sextant makes use of two mirrors. With this sextant, one of the mirrors ( mirror A in the diagram) is half-silvered, which allows some light to pass through.
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www.pbs.org/wgbh/nova/shackleton/navigate/escapeworks.h...
www.pbs.org/wgbh/nova/shackleton/navigate/escapeworks.html
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Navigation by Sextant; There's no way around it: Celestial navigation using a sextant is a complex and involved process that involves a fair amount of calculating, correcting, referring to tables, knowledge of the heavens and the Earth, as well as a lot of common sense.
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www.pbs.org/wgbh/nova/shackleton/navigate/escapenav.htm...
www.pbs.org/wgbh/nova/shackleton/navigate/escapenav.html
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Finally, navigators need an angle-measuring instrument, a sextant, to measure the angle of the celestial body above a horizontal line of reference. ... How many of you have ever held a sextant in your hand? Hold the instrument vertically and point it toward the celestial body. Sight the horizon through an unsilvered portion...
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www.mat.uc.pt/~helios/Mestre/Novemb00/H61iflan.htm
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Finally, navigators need an angle-measuring instrument, a sextant, to measure the angle of the celestial body above a horizontal line of reference. ... The first sextant was produced by John Bird in 1759. This is a very early example of his work, now in the Nederlands Scheepvaart Museum in Amsterdam. The frame is...
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pwifland.tripod.com/historysextant/
pwifland.tripod.com/historysextant/
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The CD-Sextant ; Build your own sextant ... So I went on to design an even simpler sextant, which I called CD-Sextant. This small instrument is built using a CD and box. As in the X-Tant Project, I used a few Lego blocks and glass mirrors. No electric tools are necessary to build a CD-Sextant.
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www.tecepe.com.br/nav/CDSextantProject.htm
www.tecepe.com.br/nav/CDSextantProject.htm
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Note: Since I published this text, I've done another, much easier sextant using a CD and its box. Click the banner to the righ to visit it. ... The scale is probably the most difficult sextant component to do using traditional techniques. It must be very precise and allow reading degrees and minutes, with accuracy at...
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www.tecepe.com.br/nav/XTantProject.htm
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Sextant Accessories ... Marine Sextants Sextant Accessories Aircraft Sextants Historical Binoculars Star Finding Astronomy Computer/Software Charting Systems GPS World Band Radio Time Weather Compasses PlottingTools Depthfinder Cool Things Books/Software Ordering Information International Shipping Chart United States Shipping...
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www.thesextantgroup.com/
www.thesextantgroup.com/
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