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 ...
目次
SIGNS IN THE | 5 |
THE SURFACE AND FLOOR OF THE | 21 |
THE IRISH and the NORSEMEN | 65 |
著作権 | |
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actually altitude altura angle Arab astrolabe astronomers azimuth bearings called Cape captain century chart-makers chih Chinese chronometer circle clock coast correct course course sailed cross-staff degree diagram difference distance drawn east east-west eight English Ephemerides equator equinoctial error example fact fathoms French Gemma Frisius Hariot horizon India instrument instrument-maker island Jean Rotz John John Dee king land later latitude leagues lodestone magnetic compass magnetic needle manual mariners Marteloio master mathematical measure Mediterranean Mediterranean Sea meridian method miles minutes Moon nautical navigation night north-east Nuñez observations Ocean pilots plain chart Plate Pole Star port Portuguese position quadrant quarter reckoning rhumb rhumb lines right ascension Rotz rule rutter sailing directions sailors scale seaman ship ship's sight south-east south-west Sun's Thomas Hariot tide tion triangle variation voyage William Borough wind wind-rose writing