BR 45(2): admiralty manual of the navigation, Vol. 2 Command of the Defense Council creator text 4 London The Nautical Institute 2004 monographic | 0 vi,: col. ill. The celestial sphere introduction Time systems Practical sights : planning, taking, reducing and plotting The celestial sphere definitions, hour angles and the theory of time Identification of heavenly bodies, astronomical position lines, observed position and sight reduction procedures Meridian passage and Polaris The rising and setting of heavenly bodies Refraction, dip and mirage Errors in astronomical position lines Appendix 1. The sky at night Appendix 2. Extracts from the Nautical Almanac (1997). Navigation Nautical astronomy Admiralty 623.89 AMN 1870077652 200617