Abstract
The altitude-azimuth method has been used worldwisely since the line of position was discovered by Sumner. However, the method has some defects that a dead reckoning position, a straight line of position against a position circle and so on are used. The writer, then, devised a method of position-fixing by the observations of celestial bodies by the aid of analytical geometry including running fix, altitude corrections and ephemeris problems for electronic digital computer on board. According to the method, the position with high precision and the angle of intersection of position circles can be obtained with only U.T., the names of celestial bodies and the observed altitudes.
