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July 7th, 2010, 08:20 AM  #1 
Newbie Joined: Jul 2010 Posts: 1 Thanks: 0  Longitude and latitude problem
Hi all, *main question*: I have earth point given in longitude and latitude for example (42,22) and I have a new point (42, x) and I have distance between that 2 points for example 20km. I would like to calculate unknown x for the second point. Can anybody help me with this? Thanks to all 
July 13th, 2010, 12:15 PM  #2 
Member Joined: Jun 2010 Posts: 80 Thanks: 0  Re: Longitude and latitude problem
let distance D=20km the displacement is NS, hence along a big circle, and D=r*da (length of arc with r=earth radius, da=angle difference) then : if distance is in direction S : x=22D/r, else x=22+D/r 
July 14th, 2010, 06:01 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,865 Thanks: 1833 
Will the first value (42 in the above example) always be unchanged? You will need the angle in radians for the above method. How large can D be and how accurate do you want the values for x to be?


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latitude, longitude, problem 
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