PROFESSOR W. H. ROEVER has described in detail* the application to navigational problems of several graphical methods of solving spherical triangles by the methods of descriptive geometry. He may be quoted as of the opinion that the presentation of the subject of navigation to students (especially to those students whose mathematical preparation leaves something to be desired) gains considerably in concreteness by explaining some of these graphical methods side by side with the solutions by tables or by logarithmic computation which are actually employed in practice.
Table III ........................................ 18
G.S.T.................................... 17 34 02
Long, (west) ....................... 6 01 20
L.S.T..................................... 11 33
Hour angle by the construction
(27°) ................................... -1 48
R.A. of the star ................... 13 21
From the construction, p= 100°, i.e., declination=26°. The unknown “star” is therefore Venus.
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