3d models Quadrant Navigation Tool Sailing

3D Models Quadrant Navigation Tool Sailing

3D Model Information

Product ID: 6058

Keywords:	quadrant, navigation, tool, water, ocean, old, antique, ship, boat, sailing, columbus, astrolabe, sailor, mariner, latitude, navigate, north, star
Author:	3D Models by Mr Maui
Added on:	5/10/2005
Category:	3D Models > Tools > Measuring
Summary:	Quadrant Navigation Tool Sailing 3D Models Model of early navigation tool, the quadrant, used by sailors and mariners. Exclusive! This product is sold exclusively at The3dStudio.com. (read more)
Rating:	from 5 reviews. (read free reviews)
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Exclusive Price:
$25.00

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•	Max (.max) - 953Kb

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Details

Geometry:	Polygonal
Polygons:	56711
Vertices:	30246
Textures (?):	No
Materials (?):	No
Animated:	No
Jointed:	No

Available images

Full description
Early mariners depended on their ability to determine the latitudinal position (the distance north or south of the equator) of their ships for accurate navigation. In the northern hemisphere navigators used the position of the North Star in the night sky as their primary point of reference for determining latitude. The further north one sailed, the higher in the sky or more distant from the horizon the North Star would appear. Skillful mariners could make fairly accurate estimations of their latitude by using only naked-eye observations. Precise navigation required precise calculation of the distance between the horizon and the North Star. To ensure the accuracy of their calculations, navigators used a variety of tools, including astrolabes and quadrants. Astrolabes were typically circular in shape with two viewing holes on the circumference. A moving pointer attached to the center of the circle would remain parallel to the horizon as the navigator pointed the instrument at the North Star. Once the viewing holes were aligned with the star, the sailor would read the angle between the viewing holes and the pointer and from this data calculate the latitude of the ship. Quadrants worked in a similar manner except that they were shaped only as quarter circles, and as a result they were much lighter in weight than the bulky astrolabes. Although astrolabes and quadrants enabled mariners to make observations that were more accurate than those made only by the naked eye, they were still far from perfectly dependable. On the deck of a rolling ship tossed by ocean swells, for instance, it was often difficult to maintain the steady hand necessary to make accurate calculations using an astrolabe or quadrant

Full description

Early mariners depended on their ability to determine the latitudinal position (the distance north or south of the equator) of their ships for accurate navigation. In the northern hemisphere navigators used the position of the North Star in the night sky as their primary point of reference for determining latitude. The further north one sailed, the higher in the sky or more distant from the horizon the North Star would appear. Skillful mariners could make fairly accurate estimations of their latitude by using only naked-eye observations. Precise navigation required precise calculation of the distance between the horizon and the North Star. To ensure the accuracy of their calculations, navigators used a variety of tools, including astrolabes and quadrants. Astrolabes were typically circular in shape with two viewing holes on the circumference. A moving pointer attached to the center of the circle would remain parallel to the horizon as the navigator pointed the instrument at the North Star. Once the viewing holes were aligned with the star, the sailor would read the angle between the viewing holes and the pointer and from this data calculate the latitude of the ship. Quadrants worked in a similar manner except that they were shaped only as quarter circles, and as a result they were much lighter in weight than the bulky astrolabes. Although astrolabes and quadrants enabled mariners to make observations that were more accurate than those made only by the naked eye, they were still far from perfectly dependable. On the deck of a rolling ship tossed by ocean swells, for instance, it was often difficult to maintain the steady hand necessary to make accurate calculations using an astrolabe or quadrant

Quadrant Navigation Tool Sailing 3d models