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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Plotting LOP's
From: Frank Reed CT
Date: 2006 Jun 8, 02:12 EDT
From: Frank Reed CT
Date: 2006 Jun 8, 02:12 EDT
Guy wrote: "a computer plot LOP's with Excel" There are ways, sure. I can think of at least two. I can also use a wrench as a hammer! Can you describe why you want plots like that? Here's one way: calculate your LOP's "a la Sumner". That is, you fix two latitudes and calculate two longitudes from them for each sight. That gives you two points on each LOP. The points determine a slope and a starting point. Then fill out two columns with points on those lines based on the slopes and starting locations. An ordinary x-y line graph of the data will cross your LOPs. Throwing in some x-y gridlines and other formatting will let you read off the fix, and the result should print out nicely, too. "or other standard software." Can you code? Even a very light version of Basic can usually do nice LOP plots with a lot more versatility than an Excel graph. -FER 42.0N 87.7W, or 41.4N 72.1W. www.HistoricalAtlas.com/lunars
