Octant
From Inventions
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| - | [http://catalogo.museogalileo.it/oggetto/Ottante.html | + | [http://catalogo.museogalileo.it/oggetto/Ottante.html Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 120.]<br /> |
| - | [http://brunelleschi.imss.fi.it/museum/isim.asp?c=413021 | + | [http://brunelleschi.imss.fi.it/museum/isim.asp?c=413021 Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 707.]<br /> |
Revision as of 13:49, 19 July 2010
Contents |
Description
The octant (eighth part of the circle) marked the first evolution in the design of the quadrant as a basic navigational instrument. It measures the altitude of the Sun and other celestial bodies above the horizon. From this datum, one can determine the latitude using numerical tables. The instrument consisted of an eighth of a circle divided into 45° and fitted with sighting optics. It was also used on land to find the distance between two points. In the late eighteenth century, the octant was replaced on ships by the sextant (sixth of a circle), whose 60° arc afforded a wider field of view.
Bibliographical Resources
Hofmann, Heinrich. De octantis instrumenti mathematici novi geodaetis, astronomis, geographis, nautis, architectis, militibus & fodinarum praefectis perquam utilis & accomodati usu & utilitate libellus / ab authore Henrico Hofmanno ... conscriptus ac boni publici caussâ in lucem datus. Jenae, typis haeredum Lippoldianorum, 1612.
Existing Instruments
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 120.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 707.
Images
 Heinrich Hofmann. De octantis. Jenae, 1612, c. B. |
 Heinrich Hofmann. De octantis. Jenae, 1612, c. C2. |
 Heinrich Hofmann. De octantis. Jenae, 1612. |
