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Download PDF by Miller D. D.: A. H. Clifford: The first sixty-five years

By Miller D. D.

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Because an AP can be as much as 30' of latitude or longitude from the DR, you need to plot the difference, called the intercept, on a chart before you can see how the resulting LOP squares up with the DR. However, it's always comforting to know when you get to this stage that you haven't fouled up in some major way and put yourself into the next ocean, so an altitude from the table that looks similar to the one from your sextant tends to be soothing to the spirit. The second of the three numbers from the table, +35', is the amount the altitude as observed from the AP changes as a result of a 1° change in the declination.

Basically, the formulas need three pieces of information : latitude of the benchmark, latitude of the 28 More Columns of Numbers 29 Pole difference in longitude East distance between AP and GP GP South Equator Figure 6-1. Spherical triangle with the North Pole as the apex, where the GP and AP are in the same hemispheres GP, and the difference in longitude between the benchmark and GP. What the formulas do with this data is solve an enormous spherical triangle whose points are a pole of the earth, a GP, and a benchmark.

OC• Center. S t Lou is A tr Force Station . 31lfl Figure 7-2. Marking the plotting sheet with the mid-latitude and longitude lines 48 Celestial Navigation in aNutshell high target that can be seen from many, many miles at sea. No matter what, when that looked-for land nicks the horizon or you see the first sparkle of an anticipated lighthouse, it's magic. No one is going to stop then to figure out whether the boat is 6 miles to the left or right of where the navigator said it would be. Everybody is just going to stand in awe (especially the navigator).

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A. H. Clifford: The first sixty-five years by Miller D. D.


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