The Elements of Navigation a Short And Complete Explanation of the Standard Met
The Elements of Navigation a Short And Complete Explanation of the Standard Met
W J William James Henderson
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97 s. The student will observe that in making these corrections it is very convenient to use hours and decimal fractions of hours. Remember that 6 minutes are . 1 of an hour ; 6 sec. = . 1 min. For instance, 4 hrs. , 42 min. =4. 7 hrs. ; 4 hrs. , 15 min. , = 4. 25 hrs. In making the correction for decli- nation it is not necessary to trouble your- self about a minute of time more or less. In correcting the equation, especially when you come to longitude observations, be ac- curate, for every se...cond counts. LATITUDE BY MERIDIAN ALTITUDE A meridian altitude is one taken when the celestial body observed bears true south or north of the observer, or is pre- cisely above the meridian of longitude on 95 which he stands. In the case of the sun this is at apparent noon. A meridian altitude gives the most ac- curate latitude, for reasons which will here- after be explained. The general formula for a meridian alti- tude is lat. = zenith distance + or dec- lination. Zenith distance is the distance, measured in degrees, from the point precisely over the observer's head to the observed body.
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