set term x11 enhanced    # needed for interactive mouse on my MacPorts
set parametric
set isosamples 50,50
set hidden

R = 6.37e6   # radius of sphere
set urange [-pi/2:pi/2]
set vrange [0:2*pi]
splot R*cos(u)*cos(v),R*cos(u)*sin(v),R*sin(u) w l lc rgb "yellow" title "Earth", "data.dat" u 2:3:4 with lines title "trajectory"

pause -1