The Haven-finding Art: A History of Navigation from Odysseus to Captain CookHollis and Carter for the Institute of Navigation, 1971 - 310 ページ |
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128 ページ
... angle is defined by the ratio of h to x and twice this angle is the distance of the star to the horizon . What those ' certain means ' were which the Arabs employed for finding the altitude of a star only became clear to westerners ...
... angle is defined by the ratio of h to x and twice this angle is the distance of the star to the horizon . What those ' certain means ' were which the Arabs employed for finding the altitude of a star only became clear to westerners ...
129 ページ
... angles are known and h is known , any angle can be expressed in terms of the length x . In the case of the kamal , a small wooden tablet represented the length 2h , and a string through the centre of the tablet represented the line x ...
... angles are known and h is known , any angle can be expressed in terms of the length x . In the case of the kamal , a small wooden tablet represented the length 2h , and a string through the centre of the tablet represented the line x ...
233 ページ
... angles PAB and PBA are found . The triangle is then divided by meridians PX , PY , PZ , etc. , at a chosen angle from PA , say 10 ° , when the triangles PAX , PXY , PYZ , etc. , can be solved . This gives the bearings and distances of ...
... angles PAB and PBA are found . The triangle is then divided by meridians PX , PY , PZ , etc. , at a chosen angle from PA , say 10 ° , when the triangles PAX , PXY , PYZ , etc. , can be solved . This gives the bearings and distances of ...
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actually altitude angle appears Arab astrolabe astronomers azimuth bearings called Cape century chart-makers chih Chinese circle clock coast correct course course sailed cross-staff degree Dicuil difference distance drawn east east-west eight English equator error example fact fathoms French Gemma Frisius Greek Greenland Gulf harbour Hariot horizon Hvitserk Iceland India instrument instrument-maker island Jean Rotz John Dee king land later latitude leagues lodestone longitude magnetic compass magnetic needle mariners master mathematical measure Mediterranean Mediterranean Sea meridian method miles minutes monsoon Moon nautical navigation night north-east north-west Nuñez observations ocean Odysseus pilots Plate Pole Star port Portuguese position Pytheas quadrant quarter reckoning rhumb rhumb lines rock round rutter sailing directions sailors scale seaman ship ship's shore sight south-east south-west Strabo tide tion turned variation voyage William Borough wind wind-rose writing