[Jprogramming] Finding GPS coordinates with J

[Björn Helgason]

I am slowly beginning to understand this radian/degree thing.This r...p is
also slowly beginning to trickle in.
The haversine link is quite good.

2009/3/31 Joey K Tuttle <jkt at qued.com>

> A circle is 360 Degrees and/or 2*Pi radians, so
> Pi Radians is 180 degrees or (60*180 i.e. 10800)
> Minutes. So if you have an angle represented in
> Minutes, then to convert that angle to Radians
> you might multiply Minutes * 1r10800p1 - this can
> be useful in estimates or thought experiements
> because a Nautical mile is roughly 1 Minute of
> arc at the equator. It follows that the
> circumference of the earth is about 21600
> Nautical miles.
>
> In my example, I stated the angles in fractional
> Degrees - to convert Degrees to Radians, you
> multiply Degrees * 1r180p1
>
> My typo was that I was planning to say 2r360p1 as
> the constant, and my fingers slipped in a 1
> instead of the 2 - since 2r360 reduces to 1r360
> anyway, I just corrected the denominator...
>
> - joey
>
>
> At 10:12  +0000 2009/03/31, Björn Helgason wrote:
> >Thx for a very interesting link and formula
> >Other examples have stated
> >
> >1r10800p1
> >
> >
> >
> >2009/3/30 Joey K Tuttle <jkt at qued.com>
> >
> >>  At 11:15  -0700 2009/03/30, Joey K Tuttle wrote:
> >>  >     ll =:  (64.13577516756123, -21.895751953125)
> >>  >
> >>  >     1r360p1 * ll  NB. converting degrees to radians
> >>  >0.55969 _0.191076
> >>  >
> >>
> >>  This was a silly typo... Should have been:
> >>
> >>     1r180p1 * ll   NB. converting degrees to radians
> >>  1.11938 _0.382153
> >>
> >  > Sorry about that....
> >>
> >  > - joey
>
> ----------------------------------------------------------------------
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>



-- 
Björn Helgason, Verkfræðingur
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