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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153 ページ
... equinoctial line ( or heavenly equator ) from which east - west measurements can be made . These are the points at which the Sun's path - the ecliptic - crosses the equinoctial at the spring and autumn equinoxes , and they can be ...
... equinoctial line ( or heavenly equator ) from which east - west measurements can be made . These are the points at which the Sun's path - the ecliptic - crosses the equinoctial at the spring and autumn equinoxes , and they can be ...
154 ページ
... equinoctial is called declination . And whereas east - west distance round the equator is called longitude ( for it measured the length of the known world in Ptolemy's day ) , the corresponding sky - term is right ascension . The fixed ...
... equinoctial is called declination . And whereas east - west distance round the equator is called longitude ( for it measured the length of the known world in Ptolemy's day ) , the corresponding sky - term is right ascension . The fixed ...
166 ページ
... equinoctial line ' . Here there is a discrepancy , since the table gives the declination as 23 ° 33 ′ but the odd three minutes are ignored . It is worth noting that in the list of latitudes which the manual provides the positions are ...
... equinoctial line ' . Here there is a discrepancy , since the table gives the declination as 23 ° 33 ′ but the odd three minutes are ignored . It is worth noting that in the list of latitudes which the manual provides the positions are ...
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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