太陽観測による船位測定について(II)(日本航海学会第17回講演会)

抄録

In the preceding paper, the writer studied about the method to fix the best noon position according to the combination of 1st, 2nd and 3rd sights provided that 1st and 3rd sights are preferred without restraint. Furthermore. since the day's noon position is paid much attention on the sea, he studied about the method to keep material increase in the accuracy of ship's position by adding 3rd suitable sight provided that the best combination of 1st and 2nd sights are preferred. In this case, he analyzed this problem taking 1st sight a constant dependent on latitude and declination and 3rd sight as a variable.