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Dist is a progran that given a list of planets and their coordinates can find all the planets within a given distances from a given planet of origin. The list of planets can easily be generated by joining the three planetlists generated by Planetmap.
:) planetmap Nation_1 :) cat planets.* > planets.all :) dist -f planets.all -low 20 -up 42 -orig N1_1 Loading Planets Planet of Orgin N1_1 ( 11.27 28.98) Planets in the range [20.000,42.000> from this planet. Name x y distance 11 41.13 52.67 38.12 29 40.54 51.49 36.92 33 43.92 46.99 37.29 35 21.06 4.09 26.75 37 36.06 40.14 27.19 45 39.66 30.77 28.45 49 33.37 38.78 24.18 57 0.42 3.70 27.51 60 11.86 0.75 28.24 65 14.06 51.05 22.25 66 42.34 51.34 38.28 68 2.36 53.97 26.53 85 44.56 51.26 40.06 88 50.03 17.17 40.52 97 39.07 45.99 32.59 99 33.15 4.25 33.02 101 40.84 42.29 32.43 N2_1 42.15 45.20 34.88 N2_2 42.65 46.50 35.94 N2_3 42.89 44.52 35.23