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- Compass (8275 bytes)
3: ...on]] capability. This device greatly improved maritime trade by making travel safer and more efficien...
5: ...ic instrument of a delicate type of construction. It is used by observing variations of the needle. A ...
9: Compasses were initially used in [[geomancy]] in [[ancient China]]. T...
11: ...ic needle with one single strain of silk with a bit of wax attached to the center of the needle. [[S...
15: ... the stars at night, watches the sun at day; when it is dark and cloudy, he watches the compass'' - Astrolabe (4446 bytes)
4: ...d the sun; determining local time given local longitude, and vice-versa; and surveying and triangulati...
6: ...to]] in Lisbon, which improved on the accuracy of its wooden [[Arabian]] precursors.
8: ...' which rotates over the rete, and may be marked with a scale of [[declination | declinations]].
12: ...d a star sighted along its length, so that the altitude (in degrees) of the star could be read ("taken...
16: ... established by [[Al-Battani]] in his treatise ''Kitab az-Zij'' (ca. 920), which was translated into L... - Navigation (15650 bytes)
3: There are several traditions of '''navigation'''.
7: ...heir own senses and knowledge, passed by oral tradition, from navigator to apprentice.
13: ...ldlife species (which congregate at particular positions)
18: ...rofessional small boat captain so that he could write a book.
20: ...y navigated the Pacific Ocean from Hawaii to [[Tahiti]] using no instruments.
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