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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)

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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
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This (calculating the equation of the circle intersection between two spheres) will probably help.

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