Longitude by chronometer
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Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. It is an
Mechanical boxed Marine Chronometer used on Queen Victoria's royal yacht, made about 1865
Omega 4.19 MHz (4194304 = 222 high frequency quartz resonator) Ships Marine Chronometer giving an autonomous accuracy of less than ± 5 seconds per year, French Navy issued,1980
Lunar distance (navigation)
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In celestial navigation, lunar distance, also called a lunar, is the angular distance between the Moon and another celestial body. The lunar distances method uses this angle and a nautical almanac to
Full Moon 2010
Marine sandglass MMM