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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... equator is a precisely defined line midway between two poles that are also precisely defined ; that is to say their positions can be actually identified on the ground . Con- sequently the circles of latitude can be numbered in degrees ...
... equator is a precisely defined line midway between two poles that are also precisely defined ; that is to say their positions can be actually identified on the ground . Con- sequently the circles of latitude can be numbered in degrees ...
162 ページ
... equator had been reached and the islands of S. Thomé , Principe , and Fer- nando Po placed on the chart . The conduct of African affairs was then assigned to Prince John , but political troubles , including a war with Castile ...
... equator had been reached and the islands of S. Thomé , Principe , and Fer- nando Po placed on the chart . The conduct of African affairs was then assigned to Prince John , but political troubles , including a war with Castile ...
176 ページ
... equator , you are not in fact taking the shortest and most direct route ? How is it that at the equinox the Sun is seen to rise in the east by everybody in the world whatever their distance from the equator , while at the solstices ...
... equator , you are not in fact taking the shortest and most direct route ? How is it that at the equinox the Sun is seen to rise in the east by everybody in the world whatever their distance from the equator , while at the solstices ...
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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