Take the tour ×  one sphere with radius R,named big sphere,two
point on it:a(longitude_a,latitue_a),b(longitude_b,latitude_b),
dist(a,b)=r, a as center,r as radius,there is another
sphere,named little sphere, now what is the circle equation of
the intersect of the two spheres? parameter equation of the
circle: lon=f(xx),lat=g(xx)  share|improve this question assume
the big sphere equation is:x^2+y^2+z^2=R^2, then the little
sphere is:(x-xa)^2+(y-ya)^2+(z-za)^2=r^2,but i want the
parameter equation: lon=f(x),lat=g(x) 0<=x<2pi –  user5900 Jan
16 '11 at 8:35 add comment  1 Answer  This (calculating the
equation of the circle intersection between two spheres) will
probably help.  share|improve this answer add comment  Your
Answer