CELESTIAL NAVIGATION—INTRODUCTION AND LOCATION OF CELESTIAL POINTS

Produced by the US Army air forces. "This motion picture deals with the basic principles of the location of points on the celestial sphere. The introductory sequences present the various uses of celestial navigation and use the astronomical coordinates to identify places on the earth by means of celestial bodies. Diagrams are used to illustrate the part of the chart is not the explanation; the nautical mile is described as 6,050 feet, or approximately one minute of arc at the equator. There follows a pictorial demonstration of the zenith, nadir, local hour angle, local hour angle, and bubble horizon." Indiana. "Very technical—for pre-aviation classes only." Collaborator