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
