Showing papers on "Marine chronometer published in 1976"

Instrument determining geographical coordinates - has elements depicting space as well as earths sphere

Abstract: a simple instrument for the determination of latitude and longitude of a point on the earth's surface, consists of a number of parts which can be moved relatively to each other, of which at least one represents space and at least one the geographical globe. The angles of elevation of various marked heavenly bodies and marked spots on the earth's surface and the corresponding geographical latitude can be read off. By providing a set of discs the effect of passage of time, and hence the longitude can be found. All that is required besides the apparatus itself is a vertical angle measuring apparatus, a radio receiver for the time transmitter or a chronometer. The apparatus itself consists in principle of space table (A), large circle flag (B) and time angle disc (C).

Equal hour angle method for rapid and precise simultaneous determination of astronomical time, longitude, latitude and azimuth

Abstract: Astrofix is the basis for mapping and charting badly needed in many fields of socialist construction. The equal hour angle method presented in this paper consists in noting horizontal direction when three stars cross successively the same hour circle within ten minutes or more, thus achieving easily a simultaneous determination of precise longitude, latitude and azimuth. It is unnecessary to know rough values of these elements, nor is there the need to prepare a star observing list. If only latitute and azimuth are determined, a stop watch will be sufficient; no chronometer or radio receiver is needed. Theoretical study and experimental results have proved the advantages of this method.