VENUS AS A DAY SIGHT
By Lieutenant R. B. Carney, U. S. Navy
The problem of accurately determining the ship's position during the day is one that presents many difficulties and varying errors. For the most part, it seldom occurs that proper cross-bearings can be obtained and the navigator is obliged to fall back on that rather uncertain quantity, the run to local apparent noon. On ships whose missions permit of steady steaming on an uninterrupted course, the calculation of the correct interval to noon presents few real difficulties and no real disadvantages, but there are many times in the course of naval work where it is well-nigh impossible to properly run the ante-meridian sight up to local apparent noon with any degree of certainty. The navigator cannot be considered in the matter of maneuvers, and this very question of maneuvers gives rise to an error that varies in amount with the character of the evolutions performed, and with the nature of the ship performing them.