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shg;R0=1;a=12*R0;b=9*R0;
T0=2*pi;
T=5*T0;dt=pi/100;t=';
f=sqrt(a^2-b^2);
th=12.5*pi/180;
E=exp(-t/20);
x=E.*(a*cos(t)-f);y=E.*(b*cos(th)*sin(t));z=E.*(b*sin(th)*sin(t));
plot3(x,y,z,'g')
=sphere(30);X=R0*X;Y=R0*Y;Z=R0*Z;
grid on,hold on
surf(X,Y,Z)
shading interp
x1=-18*R0;x2=6*R0;y1=-12*R0;y2=12*R0;z1=-6*R0;z2=6*R0;
axis()
view()
comet3(x,y,z,0.02)
hold off
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