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D. VAN NOSTRAND COMPANY
Publishers and Booksellers
25 PARK PLACE NEW YORK
VAN NOSTRAND'S NAUTICAL MANUALS
175 Pages 5 × 7½ Postpaid, $2.00
The Whys and Wherefores
of
Navigation
By
GERSHOM BRADFORD, 2d.
Navigating Officer and Senior Instructor
New York State Nautical Schoolship Newport
Late Nautical Expert
Hydrographic Office, U.S.N.
Contents: Nautical Astronomy. Declination. Right Ascension. Precession of the Equinoxes. Time. Sidereal Time. Equation of Time. Calendar. Corrections for Observed Altitude. Index Correction. Semi-diameter. Refraction. Dip. Parallax. Circum or Ex-Meridian Altitude. Polaris. Observations for the Correction of the Compass. Longitude. Sumner Method. The New Navigation. The Moon. Charts.