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 <[email protected]> > 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 <[email protected]> > > > >> 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 > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Björn Helgason, Verkfræðingur Fugl&Fiskur ehf, Þerneyjarsundi 23, Hraunborgum Po Box 127,801 Selfoss , t-póst: [email protected] gsm: +3546985532 Landslags og skrúðgarðagerð, gröfuþjónusta http://groups.google.com/group/J-Programming Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans góður kennari getur stigið á tær án þess að glansinn fari af skónum /|_ .-----------------------------------. ,' .\ / | Með léttri lund verður | ,--' _,' | Dagurinn í dag | / / | Enn betri en gærdagurinn | ( -. | `-----------------------------------' | ) | (\_ _/) (`-. '--.) (='.'=) ♖♘♗♕♔♙ `. )----' (")_(") ☃☠ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
