Captain G. P. Hadjilias, N.C., M.I.N.

Peer Reviewed

Abstract: One of the smartest methods by which a geographical positioncan be fixed by means of two successive observations of the same heavenly body, is the will known system established about thirty years ago by the famous American Mathematician Mr. Edward J. Willis, of Richmond Virginia. The late Mr. Willis establishes the differential equation which is fundamental proved at any moment on which a position line cuts the parallel of Latitude of the D.R. Position. The same equation applies to teh value of the Sine of an angle, which occurs on the great circle of the Equator, and is formed between this circle and the line of Azimuth. For over thirty years I have tried this method, and I have considered it a great honor to have been one of Mr. Willis' friends and cooperators. Especially at such times that his method was first publicized, and at which the European School practically tabooed the method right after it became known. The theoretical part of the method is simply impecable, and it could be of great practical value to Navigators, in case most of its practical drawbacks could be overcome. It is with great pleasure that I have read in one of the issues of the U.S. Naval Institute's Proceedings, (I think it was in the year 1960 or 1061), an article written by the celebrated Captain Weems U.S.N., as to the practical value and the possibility of incorporating the equation,to prepare special Navigation Tables, so that ultrasonic vehicles could fix their positio using as a basis, the rate of change of the Altitude with respect to time.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 12, Number 3
Pages: 223 - 226
Cite this article: Hadjilias, Captain G. P., N.C.,, M.I.N.,, "OPTICAL SYSTEM TO IMPROVE ACCURACY OF ASTRONOMICAL OBSERVATIONS", NAVIGATION: Journal of The Institute of Navigation, Vol. 12, No. 3, Fall 1965, pp. 223-226.
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