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 July 7th, 2010, 07:20 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, 11:15 AM #2 Member   Joined: Jun 2010 Posts: 80 Thanks: 0 Re: Longitude and latitude problem let distance D=20km the displacement is N-S, 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=22-D/r, else x=22+D/r
 July 14th, 2010, 05:01 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,375 Thanks: 2010 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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