Astra IIIB - Regina - Sail Training
Astra IIIB - Regina - Sail Training
Astra IIIB - Regina - Sail Training
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<strong>Astra</strong> <strong>IIIB</strong> with WH Mirror | <strong>Astra</strong> <strong>IIIB</strong> | Marine Sextants | Celestaire, Inc.<br />
6/14/12 9:34 AM<br />
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ASTRA <strong>IIIB</strong> WITH WH MIRROR<br />
The <strong>Astra</strong> <strong>IIIB</strong> has somewhat revolutionized celestial navigation.<br />
Never before has such a high quality, accurate metal sextant been<br />
available at such a low price.<br />
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The <strong>Astra</strong> <strong>IIIB</strong> has somewhat revolutionized celestial navigation. Never before has such a<br />
high quality, accurate metal sextant been available at such a low price. Over 23,000<br />
sextants of this model have been sold in the US alone in the past 26 years; far more than<br />
any other serious sextant. Its popularity has spread throughout the rest of the world as<br />
well, making it the the most recognized (and supported) sextant worldwide.<br />
Its low price, excellent optics, and choice of horizon mirrors and other accessories makes it<br />
the perfect selection for beginners. Yet, we know several professional navigators who<br />
prefer the ASTRA <strong>IIIB</strong> merely because they can leave their expensive models at home<br />
without sacrificing noticeable accuracy. The <strong>Astra</strong> <strong>IIIB</strong> is made by the Changzhou Celestaire<br />
Instrument Co. in China, with whom Celestaire is joint-ventured, and it is produced in<br />
accordance with our specific quality guidelines.<br />
Construction Details<br />
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The frame is made from lightweight aluminum alloy which resists corrosion. Aluminum alloy<br />
is not new to sextant construction. It has long been used by many manufacturers for<br />
lightweight versions of their heavier brass or bronze sextants in order to reduce arm<br />
fatigue and unsteadiness among infrequent users. The sextant is electrically lighted by an<br />
LED on the arc and drum.<br />
The <strong>Astra</strong> <strong>IIIB</strong> is considered by many to be the easiest sextant to use. Its light weight and<br />
excellent balance makes it a pleasure to hold and makes sights easier to take under<br />
dynamic weather and sea conditions. Even reading the sextant is easier under low light<br />
conditions by having white degree marks against a black background as opposed to scribe<br />
marks on a brass arc.<br />
The index mirror is rectangular in shape and is the same size as used more expensive<br />
sextants. This shape allows more aspect of the mirror to be available for high angle sights.<br />
This means the sextant does not have to be held as steady for them. An index mirror<br />
upgrade kit is available for older models having smaller, round, index mirrors. It comes<br />
mounted in a rectangular frame and has instructions for easy installation.<br />
We are impressed with the degree to which each component of the sextant is tested. For<br />
example, each mirror and shade glass is tested for perfect flatness by the Fresnel<br />
diffraction pattern method. The sextants are assembled and tested in a clean, professional,<br />
environment. Random units have been tested by us and several professional navigators,<br />
with results that rival the most expensive German and Japanese models.<br />
Features<br />
The ability to quickly and economically change the type of horizon mirror is an attraction of<br />
this sextant to many navigators. This is because whole horizon mirrors are generally<br />
preferred by beginners who later may wish to change to a traditional mirror as proficiency<br />
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<strong>Astra</strong> <strong>IIIB</strong> with WH Mirror | <strong>Astra</strong> <strong>IIIB</strong> | Marine Sextants | Celestaire, Inc.<br />
6/14/12 9:34 AM<br />
is attained (see "Selecting A Marine Sextant").<br />
Maintainability is appreciated by schools and other groups who because of heavy usage<br />
need inexpensive replacement parts due to the threat of student mishandling.<br />
Included and Optional Equipment<br />
The sextant has LED lighting of the arc and drum powered by two standard size AA<br />
batteries (not included) which install in the handle. It comes in a varnished wooden case,<br />
with instruction book, certificate of accuracy, and adjusting wrench. Case external<br />
dimensions are 6.5 x 13 x 11 inches. It includes a 3.5x40 monocular telescope as standard<br />
equipment.<br />
Optional accessories include a 7x35 prism telescope, a slip-on rubber eyecup for use while<br />
wearing glasses, and a zero-magnification sight tube. A practice bubble horizon (see page<br />
11) is available which facilitates effective back-yard practice without the need for a sea<br />
horizon. Although the sextant comes with a choice of either whole horizon or traditional<br />
split horizon mirror, an extra mirror of either kind is available at nominal cost, and comes<br />
already mounted in its frame. Changing mirrors is done quickly by means of two easily<br />
manipulated screws.<br />
Shipping weight includes all accessories ordered from this page. Nat'l Stock Number (NSN)<br />
6605-014382949. SW 20 lbs.<br />
Arc<br />
Accuracy<br />
SPECIFICATIONS<br />
-5° + 130°, radius 153mm<br />
± 20", throughout the arc<br />
Micrometer Drum 1' scale, vernier to 0.1'<br />
Horizon Mirror<br />
Index Mirrors<br />
Shades<br />
Weight<br />
51mm diameter<br />
56x42mm<br />
4 index - 3 horizon<br />
2 lbs., 10 oz<br />
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Last Updated: June 14, 2012 07:33 AM<br />
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